With the version of Peerio released on December 18, we have turned off automated resharing of files when they are migrated to our new file system. Peerio users who migrated after this version was released will need to manually reshare files with their contacts. If you're seeing this message it means that some of the files you were sent on Peerio are from users who's files were not reshared with you.
On the desktop version of Peerio you can identify these files by looking for the Pending tag in your files tab.
On the mobile app you can tap the menu icon to the right of the file name to see if a file is pending.
These files will must be downloaded then uploaded back into Peerio to be kept. In a future update these files will be permanently removed from Peerio.
Read more about our file system improvements on our blog.