I purchased the year ad free sync pro for $16.99 the day it launched. I wanted to support what seemed to be a great app for a new platform even though that was an excessively steep price.
At this point I wish I hadn't wasted my money.
After the last app update every time I opened the app it would crash. I attempted to clear the cache, clear the data, then reinstall the app. It would crash every time I tried to restore my backup. I reached out to the developer first and told them my issue. They initially replied back and said they would look into it and I provided extra information. Went several days with no update and I attempted to contact them again and got no response. I then asked for a refund because it doesn't recognize that I purchased the Pro upgrade. Again no reply. I then tried to get a refund through Google and also no luck and that I should contact the developer.
I will never again purchase sync pro for lemmy or any other platform and I would caution anyone else from spending an arm and a leg for this app when there are plenty of equally good alternatives.
Just saying that there could have been some kind of payment issue, it's better to ensure everything is fine on that front first. Anyway I bought the lifetime adfree and I'm happy with it, although I don't use it as often as the mobile web-UI since I can't do most of the instance admin stuff through it.
I'm very glad that you're happy with your purchase.