I tried importing a tab from ultimate-guitar (.gp4) and after about 10 minutes fatpick notified me that the tab was ready to play, but when I opened it up the tab was empty. The name was imported correctly, but it looked like that was it.
Since this is a semi-established space that you're just putting a few variations on, concur with other posters suggesting you need to reduce friction. There shouldn't need to be a login process to start playing pre-built tabs, and if users can't already see tabs others have uploaded you need that function soonest.
Thanks for the feedback PhaedrusV, and apologies for the issue you encountered.
I just tested the Lumineers song you uploaded (meaning that I played your exact import, not that I imported the gp4 file from scratch) and it seems to be working ok for me.
I think that if you try again it will probably work. I think the problem you encountered was that the file wasn't properly (fully) downloaded when the app tried to open it. Specifically that sounds like an example of a file-download race condition we're working on (I mentioned it elsewhere in this discussion if you are curious).
Usually when this happens if you just hit the back button in the header to go back to the track-selection screen, wait a few seconds and then hit the play (or forward) button it will work the second time around.
I realize what a crappy UX it is when that happens but it is almost always a temporary glitch. If you go back to the track selection screen, give it a second to finish flushing to disk it should work. (Moreover once the file is loaded to your local cache you shouldn't see the problem again.)
If you are still having problems you could try flushing your local cache (go to the Settings, toggle "Advanced Options" to on then clicking the "Clear Cache" button that now appears at the bottom) and try again.
If you are still having problems even after that please reach out via the contact form in the app, or online at https://www.fatpick.com/contact-us, or contact me directly as rod@<that-domain> and we'll work it out.
Since this is a semi-established space that you're just putting a few variations on, concur with other posters suggesting you need to reduce friction. There shouldn't need to be a login process to start playing pre-built tabs, and if users can't already see tabs others have uploaded you need that function soonest.
Will check back later, cool idea in general.
In case you're wondering, the tab I tried to upload: https://tabs.ultimate-guitar.com/tab/the_lumineers/ho_hey_gu...