Hello tiled community! I recently discovered this piece of software, and i would like to share some feedback!
Right now you have to use the internal tile animation editor, which many people might be uncomfortable with, and would like to use their own software. For example, you should be able to import: GIF (While the format is largely outdated, its still widely used), sprite sheets, Pixly's/Aseprite's .anim (I recently discovered it, and it seems very nice. It uses a spritesheet and some XML for frames)
Btw, both the editor and the TMX format are awesome, and really well designed!
Good luck with development, -Danik32