Helium (carbon) won't recognize backup files I backed up to an SD card using Helium before factory resetting my Samsung Galaxy S5. Helium could find my backups and gave the option to &quot;restore&quot; before factory reset - after, it's not.
I've tried this method:

Start Helium
Pick any &quot;dummy app&quot; to create a backup from
Exit Helium
Check where it placed the backup files, and which files those are (a backup consists of multiple files)
Copy your backup files to that location
Check if for each app there are all the files you've checked above1
Start Helium again, it now should find the backups
Restore whatever you wanted to restore

But it still only sees the recently backed up apps, not the many others I've pasted there.
What is different about my previously backed-up apps that it is not recognizing?
It's because the files within the com.koushikdutta.backup/files are deleted whenever

You uninstall Helium Backup, or
The phone has been factory reset

If those files are missing, Helium Backup will fail to recognize any of your backups, even if they exist and is easily restorable.
Requiring those files to exist in order to restore backups is honestly quite a retarded system.