I'll try to keep this short.
Osu!Mania maps can be from 4K to 8K, and you can't change that. The ones Osu! makes for maps not intended for Osu!Mania change key amounts based on difficulty (easy is 4K, hard is 7-8K) which makes new players trying to learn higher key amounts and experienced low key amounts out of luck. There should be a way for you to set a key amount that you want to play, such as forcing 4K on 7K maps, 7K on 4K maps, etc. so it would make more maps able to be played by people.
If this is a duplicate, sorry in advance.
Osu!Mania maps can be from 4K to 8K, and you can't change that. The ones Osu! makes for maps not intended for Osu!Mania change key amounts based on difficulty (easy is 4K, hard is 7-8K) which makes new players trying to learn higher key amounts and experienced low key amounts out of luck. There should be a way for you to set a key amount that you want to play, such as forcing 4K on 7K maps, 7K on 4K maps, etc. so it would make more maps able to be played by people.
If this is a duplicate, sorry in advance.