If you own a low storage, 16 GBs iPad model, then there is little to be done.
A 16 GBs storage iPad starts out, after initial drive formatting, at approx. 14.5 GBs of free, internal storage.
After the installation of iPadOS, at approx. 6.5 GBs, leaves 8.0 GBs of of free, internal data storage space.
iOS/iPadOS needs a minimum of 3-6 GBs of constant remaining storage, that MUST BE MAINTAINED AT ALL TIMES, to insure/ensure nominal, acceptable operation of all iOS/iPadOS functionalities.
This leaves a 16 GBs iPad with ONLY a practical, usable storage space of between 2 and 5 GBs AND THAT IS IT!
This is virtually NO internal data storage to do much of anything with that iPad!
This is why Apple quietly, silently did away with all 16 GBs iOS device back sometime in 2016.
You may need to purchase a much larger internal data storage iPad.
Sorry.