Nice work!
Take a look at this guy's assets, this one is free to download.
https://sventhole.itch.io/bandits
The best way to put these up is as png frame by frame, but you can do a single png with all the frames aligned next to each other but it takes time to cut them in unity so we are very grateful if it's already seperated.
One more thing but it might be just me, some people put up for example single png-s where if there's any movement involved the frames slightly move out of center to any direction but I always recenter them because I don't want the animation to move my character I always move them by code so for me if the pngs are centered thats a bonus.
I hope this answers your question.