I think I can see what the problem is and I don't see it mentioned above.
The screenshot shows the file system as ExFAT and the file format as NTFS
The iPad can't read NTFS- Macs can
But that's confusing for the ipad anyway. To the iPad it will look corrupted.
I've never seen this before so I don't know how to fix it except to reformat.
Was it used on a Windows machine at work for instance?
Maybe on a machine that can read it you can change the file formats?
Someone else can probably jump in with some better ideas.