It seems we talk about different things:

I want to know if your FINAL mod,
could do:

User-add: New link with 1 to x uploads (pics,pdf, doc)
User-mod:
- Change fields as normal
- add new files
- delete files
- replace files

The same to admin:

I talk about LINKS 2; for 1.13 i have this stuff done (without modifying by user, i have solved this by doing an add, if files are send with and manually delete the old link)

Robert