Not a dumb question! The GIFs that are included are not true to size - they are enlarged with the goal of being readable/people can see how the animations should be played out. So they are not meant for importing for use necessarily.
Viewing post in DVA'S Platformer Characer Asset Pack: Thicc 'N' Juicy comments
You would have to cut them out one by one if the engine doesn't allow for inputting an entire sheet and autoslicing. Unity does this, which is great, but GDevelop is funky. I use that engine as well and they have a very hit or miss way to put in a sprite sheet. You would have to make sure each sprite or animation frame is spaced equally, then put it into Piskel within GDevelop, set the size to whatever your sprite spacing size is, and then it would cut it for you. Here's a video I found.
Gotcha, that's how I've been doing it, but it is incredibly tedious haha. I haven't seen this video, so hopefully it will tech me some new tips and ideas that I can start using.
Btw, I'll have a project for you to see using your sprite sheet in a little bit. Its been very nice to use. Thanks so much for your replies! You've been very helpful