[Most Adjustment layers do not work]

Hello everyone

can someone please help me with adjustments on my 2019 ipad pro 12.9

I can’t for the life  of me get curves and many other adjustments to work.

I cant add a preset and there are no presets to begin with

As you can see the curves (and many many others)has no presets and I don’t know how to start or add one

This is not an issue with brightness/contrast where at least there are presets from which to start and  save.

can anybody please help and tell me what im doing wrong?

thank you

luigi.