Detect if Export template is correctly setup

[LauraWebdev]

I don't think there is a C# API to do this, but maybe a simple solution could be to read the export file and detect the string "Steamdeck".

[IgorBayerl]

That would be a great addition!
I initially thought the add-on wasn’t working because the progress bars for “Building,” “Preparing,” and “Uploading” were moving but then seemed to get stuck.
It turned out I had a typo in the build name, so nothing was actually happening ... even though it looked like it was.

A detection check for a correct export template would have saved me from this confusion.