There are a few things going on in this thread, so to cover all of them:
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You were previously given direct guidance by mods that throwing snark, insults, or passive aggressiveness, is not allowed. Please drop the “OMG” and eyerolls in your responses going forward. No further warnings will be issued, further instances will lead to permanent action being taken on your forum access.
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Piskel doesn’t support multi-animation spritesheets, only splitting single animation spritesheets. There is no workaround for that as that tool doesn’t support it to begin with.
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GDevelop doesn’t natively support spritesheets, the way it builds animations requires multiple singular image files. What you’re asking for (some way to load a singular spritesheet file and have it be used for all animations on a sprite object) does not exist in the engine, and would require a rework of how the sprite object and animations work today.
As far as I know there are no active plans to change this. There is an existing spritesheet (and atlas) feature request that you are welcome to vote up on the trello and existing threads that ask for and point to this, so a new thread isn’t needed. Always ensure you’re following the feature request rules and not making a duplicate request going forward.
As an alternative, you can try the community made “Sprite sheet animations” extension in the main extension list. You will need to research and test with that extension as it requires some pretty complete understanding of your sprite sizes and a compatible spritesheet. As with all extensions no official support is provided, and since it works using the Tiled Sprite object, you will need to pin it to another sprite object if you want to customize your collision mask or points in anyway.
Hopefully the above adds some context, thanks!