Facing issue with custom file upload feature in MS Copilot Studio

[rishabhcopilot01]

Describe the bug
Trying to build functionality to allow users to upload files using copilot studio chatbot. Currently, facing issues while trying to launch webpart on localhost. Exact error shared below : -

AssertionError [ERR_ASSERTION]: Handler [handler-0 on GET /api/azurestorage/uploadsastoken] is missing a third argument (the "next" callback) but is not an async function. Middleware handlers can be either async/await or callback-based.Callback-based (non-async) handlers should accept three arguments: (req, res, next). Async handler functions should accept maximum of 2 arguments: (req, res).

We are referencing the below Github Component to build this functionality : -
https://github.com/microsoft/CopilotStudioSamples/tree/master/BuildYourOwnCanvasSamples/2.location-and-file-uploading

Can you please assist with next steps.
Happy to get on a call and discuss.

Expected behavior
The file upload button should appear on copilot studio chatbot that helps in uploading file directly to azure blob storage.

Screenshots

[pete-willisSP]

I have the same issue

AssertionError [ERR_ASSERTION]: Handler [handler-0 on GET /api/azurestorage/uploadsastoken] is missing a third argument (the "next" callback) but is not an async function. Middleware handlers can be either async/await or callback-based.Callback-based (non-async) handlers should accept three arguments: (req, res, next). Async handler functions should accept maximum of 2 arguments: (req, res).

[NischalRam]

if you are getting this error:

AssertionError [ERR_ASSERTION]: Handler [handler-0 on GET /api/azurestorage/uploadsastoken] is missing a third argument (the "next" callback) but is not an async function. Middleware handlers can be either async/await or callback-based.Callback-based (non-async) handlers should accept three arguments: (req, res, next). Async handler functions should accept maximum of 2 arguments: (req, res).

try to decrease the npm version

install nvm

run

nvm install v14.21.3

then run

npm start

to download nvm

https://www.freecodecamp.org/news/nvm-for-windows-how-to-download-and-install-node-version-manager-in-windows-10/
https://github.com/coreybutler/nvm-windows/releases

worked for me