Unable to view the content

I don’t have 2 x 32 gab drives but as my original post says, one 128gb drive. I have tried formatting as exFAT and MSDOS FAT, neither achieve anything. I can see folders and files I have copied to the drive when I plug it into the computer but when connected via the app to my iPad it sees nothing and sometimes tells me the stick is operating as a USB drive and cannot access it. That despite it having been switched off and on again and restored.

Richard