First of all, thank you for making this great piece of software. It made my switch from windows much easier. This is easily the best photo transfer utility available on Linux.
That being said, there are a few things that could be done better (at least in my opinion) that may not have been considered depending on the way someone uses the software.
In my use case, I frequently need to download pictures from the same source to multiple locations. I always group photos by day and select groups that I need to download to one location, download those while deleting the files from the source, and rinse and repeat.
This is made quite difficult by the fact that all of the pictures are already selected at the start. Clearing this selection can be difficult (at least I had a hard time figuring it out. (it would be a nice option to not have anything selected by default). Microsoft Photo Gallery (which is now discontinued but still the best photo download tool on Windows) has a check box for each group of photos that makes this very easy to do. I would usually select a set of pictures to import and set for automatic deletion after importing, then go back and select the next set to import.
Grouping works by number of hours. It would be much more useful to be able to group by Day, Week or Month …
Check boxes on the thumbnails are a bit buggy. It’s like the clickable area is much smaller than the check box. Also, checking the box requires multiple clicks (it’s not reliable enough to figure out if it’s a double or single click). Unchecking the box seems to be a single click but only in a small area in the corner of the check box.
Those are the issues I encountered while using this software. It’s great otherwise and still the best I was able to find for Linux. I’m running Fedora 32 by the way.