diff --git a/action.yml b/action.yml
index 3b4ddb4..9580b55 100644
--- a/action.yml
+++ b/action.yml
@@ -4,7 +4,10 @@ author: 'GitHub'
 inputs:
   upload_url:
     description: 'The URL for uploading assets to the release'
-    required: true
+    required: false
+  release_tag:
+    description: 'The tag of release for uploading assets'
+    required: false
   asset_path:
     description: 'The path to the asset you want to upload'
     required: true
diff --git a/dist/index.js b/dist/index.js
index 6f0342d..788925c 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -4114,16 +4114,50 @@ function octokitDebug (octokit) {
 /***/ (function(module, __unusedexports, __webpack_require__) {
 
 const core = __webpack_require__(470);
-const { GitHub } = __webpack_require__(469);
+const { GitHub, context } = __webpack_require__(469);
 const fs = __webpack_require__(747);
 
+async function getUploadUrlByReleaseTag(github, releaseTag) {
+  // Get owner and repo from context of payload that triggered the action
+  const { owner, repo } = context.repo;
+
+  // Get the default tag name from the triggered action when not given
+  const tagName = releaseTag || context.ref;
+
+  // This removes the 'refs/tags' portion of the string, i.e. from 'refs/tags/xxx' to 'xxx'
+  const tag = tagName.replace('refs/tags/', '');
+
+  // Get a release from the tag name
+  // API Documentation: https://developer.github.com/v3/repos/releases/#create-a-release
+  // Octokit Documentation: https://octokit.github.io/rest.js/#octokit-routes-repos-create-release
+  const response = await github.repos.getReleaseByTag({
+    owner,
+    repo,
+    tag
+  });
+
+  // Get the upload URL for the created Release from the response
+  const {
+    data: { upload_url: uploadUrl }
+  } = response;
+
+  return uploadUrl;
+}
+
 async function run() {
   try {
     // Get authenticated GitHub client (Ocktokit): https://github.com/actions/toolkit/tree/master/packages/github#usage
     const github = new GitHub(process.env.GITHUB_TOKEN);
 
     // Get the inputs from the workflow file: https://github.com/actions/toolkit/tree/master/packages/core#inputsoutputs
-    const uploadUrl = core.getInput('upload_url', { required: true });
+    const uploadUrlVar = core.getInput('upload_url', { required: false });
+    const releaseTag = core.getInput('release_tag', { required: false });
+
+    const uploadUrl = uploadUrlVar || (await getUploadUrlByReleaseTag(github, releaseTag));
+    if (!uploadUrl) {
+      throw new Error('UploadUrl was not supplied and was failed getting by releaseTag');
+    }
+
     const assetPath = core.getInput('asset_path', { required: true });
     const assetName = core.getInput('asset_name', { required: true });
     const assetContentType = core.getInput('asset_content_type', { required: true });
diff --git a/src/upload-release-asset.js b/src/upload-release-asset.js
index 411bdcf..538ecc6 100644
--- a/src/upload-release-asset.js
+++ b/src/upload-release-asset.js
@@ -1,14 +1,48 @@
 const core = require('@actions/core');
-const { GitHub } = require('@actions/github');
+const { GitHub, context } = require('@actions/github');
 const fs = require('fs');
 
+async function getUploadUrlByReleaseTag(github, releaseTag) {
+  // Get owner and repo from context of payload that triggered the action
+  const { owner, repo } = context.repo;
+
+  // Get the default tag name from the triggered action when not given
+  const tagName = releaseTag || context.ref;
+
+  // This removes the 'refs/tags' portion of the string, i.e. from 'refs/tags/xxx' to 'xxx'
+  const tag = tagName.replace('refs/tags/', '');
+
+  // Get a release from the tag name
+  // API Documentation: https://developer.github.com/v3/repos/releases/#create-a-release
+  // Octokit Documentation: https://octokit.github.io/rest.js/#octokit-routes-repos-create-release
+  const response = await github.repos.getReleaseByTag({
+    owner,
+    repo,
+    tag
+  });
+
+  // Get the upload URL for the created Release from the response
+  const {
+    data: { upload_url: uploadUrl }
+  } = response;
+
+  return uploadUrl;
+}
+
 async function run() {
   try {
     // Get authenticated GitHub client (Ocktokit): https://github.com/actions/toolkit/tree/master/packages/github#usage
     const github = new GitHub(process.env.GITHUB_TOKEN);
 
     // Get the inputs from the workflow file: https://github.com/actions/toolkit/tree/master/packages/core#inputsoutputs
-    const uploadUrl = core.getInput('upload_url', { required: true });
+    const uploadUrlVar = core.getInput('upload_url', { required: false });
+    const releaseTag = core.getInput('release_tag', { required: false });
+
+    const uploadUrl = uploadUrlVar || (await getUploadUrlByReleaseTag(github, releaseTag));
+    if (!uploadUrl) {
+      throw new Error('UploadUrl was not supplied and was failed getting by releaseTag');
+    }
+
     const assetPath = core.getInput('asset_path', { required: true });
     const assetName = core.getInput('asset_name', { required: true });
     const assetContentType = core.getInput('asset_content_type', { required: true });
diff --git a/tests/upload-release-asset.test.js b/tests/upload-release-asset.test.js
index cf95ec8..1c22f33 100644
--- a/tests/upload-release-asset.test.js
+++ b/tests/upload-release-asset.test.js
@@ -9,6 +9,7 @@ const run = require('../src/upload-release-asset');
 
 /* eslint-disable no-undef */
 describe('Upload Release Asset', () => {
+  let getReleaseByTag;
   let uploadReleaseAsset;
   let content;
 
@@ -19,6 +20,12 @@ describe('Upload Release Asset', () => {
       }
     });
 
+    getReleaseByTag = jest.fn().mockReturnValueOnce({
+      data: {
+        upload_url: 'upload_url'
+      }
+    });
+
     fs.statSync = jest.fn().mockReturnValueOnce({
       size: 527
     });
@@ -31,8 +38,11 @@ describe('Upload Release Asset', () => {
       repo: 'repo'
     };
 
+    context.ref = 'refs/tags/release_tag';
+
     const github = {
       repos: {
+        getReleaseByTag,
         uploadReleaseAsset
       }
     };
@@ -40,10 +50,49 @@ describe('Upload Release Asset', () => {
     GitHub.mockImplementation(() => github);
   });
 
-  test('Upload release asset endpoint is called', async () => {
+  test('Upload release asset endpoint is called via upload_url', async () => {
     core.getInput = jest
       .fn()
       .mockReturnValueOnce('upload_url')
+      .mockReturnValueOnce(null)
+      .mockReturnValueOnce('asset_path')
+      .mockReturnValueOnce('asset_name')
+      .mockReturnValueOnce('asset_content_type');
+
+    await run();
+
+    expect(uploadReleaseAsset).toHaveBeenCalledWith({
+      url: 'upload_url',
+      headers: { 'content-type': 'asset_content_type', 'content-length': 527 },
+      name: 'asset_name',
+      file: content
+    });
+  });
+
+  test('Upload release asset endpoint is called via release_tag', async () => {
+    core.getInput = jest
+      .fn()
+      .mockReturnValueOnce(null)
+      .mockReturnValueOnce('release_tag')
+      .mockReturnValueOnce('asset_path')
+      .mockReturnValueOnce('asset_name')
+      .mockReturnValueOnce('asset_content_type');
+
+    await run();
+
+    expect(uploadReleaseAsset).toHaveBeenCalledWith({
+      url: 'upload_url',
+      headers: { 'content-type': 'asset_content_type', 'content-length': 527 },
+      name: 'asset_name',
+      file: content
+    });
+  });
+
+  test('Upload release asset endpoint is called via default release_tag', async () => {
+    core.getInput = jest
+      .fn()
+      .mockReturnValueOnce(null)
+      .mockReturnValueOnce(null)
       .mockReturnValueOnce('asset_path')
       .mockReturnValueOnce('asset_name')
       .mockReturnValueOnce('asset_content_type');