With Cypress, you can easily create tests for your modern web applications, debug them visually, and automatically run them in your continuous integration builds.

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I just tried it in a clean [repository](https://github.com/sweidac/cypress-selectFile) and it works there. Unfortunately I can't share my original code, so I'll have to find it out for myself.

Ok, I just discovered that `Cypress.version` returns `'9.1.0'` when run in the console during a test. The settings tab in the cypress window says im on `9.4.1` as well as `./node_modules/cypress/bin/cypress --version`

You may need to clear the cypress cache, then do a fresh install. You can find more in the docs here: https://docs.cypress.io/guides/references/troubleshooting#Clear-Cypress-cache

Unfortunately that didn't help. I'm now trying to run the test on a machine that has never heard of cypress to check whether it's something in my repo.

I think I fixed it: 
The testrunners storage (Chromium 97)  needed to be reset' manually. Then `Cypress.version` yields the correct value and `selectFile()` is available where I expected it.

Just in case u wonder how to reset:
1. Open Devtools
2. Open "Application" tab
3. Click on the side-navigation, click on "Storage"
4. Click on "Clear site data"
5. Reload the site

On Firefox, you need to
1. Open Settings
2. Open "Privacy & Security"
3. Click "Clear Data"
4. Clear all
5. Restart Browser

This is really great to know! Can you confirm if you needed to do this in the Cypress App or if this was done in your actual browser?

Sorry for not responding.
This needs to be done in the browser that executes each test, __NOT__ the Cypress app.

No worries at all! Thanks so much for confirming!