Importing Data Project Solved

I am running Audacity 2.2.1 on Linux Mint 19.3 Cinnamon. Several years ago I transferred a cassette tape to my computer and saved it as a data project in the hopes that I would go back later and split the tracks. I now have a ton of .AU files in different folders and I cannot figure out how in the world to import all of them back into Audacity and put them back in order. Audacity will only let me import one at a time and they are all out of order. I don’t have very much experience with Audacity - can someone possibly give me some guidance? Thank you

You need the associated “.AUP” file …

Thank you for sending me the tutorial - the .aup files were saved in a different place than the individual .au files. I will go ahead and mark this as solved.