Statment of the problem
As others have discussed, there is no native way to import a text file into Thunkable. Using the Webviewer Component and Thunkable(ReactNative) WebExtension I was able to create a file upload feature with a simple HTML file hosted on the Firebase’s free Web Hosting
You could do this on any hosting site. But experienced Thunkers will already have a free Firebase account. Just enable hosting and you now have a site. I set up the site following by deploying hosting as well as my NodeJS functions.
The blocks are actually super simple. The Live Test Web app can access the emulated firebase site (which is great for testing). Devices obviously cannot use the emulated site, so my start event controls which buttons are visible.
The button set the URL to my simple file upload page and shows/hides the appropriate components.
note: the verision displayed below did not update the status as indicated in the HTML above.