This issue will be fixed in our next update (v2.7.26) scheduled to be available in about a week. We apologize for any inconvenience.
In the meantime, you can import the file from the Dropbox app or any other sharing app (OneDrive, Google Drive, etc.)
For example, to import from the Dropbox app please follow these steps:
Open the Dropbox app
Locate and select the CSV or QuickSaleInventory file
Tap the icon with three dots (•••) located at the right side of the filename or at the top right-hand corner of the screen.
A menu should appear. Tap Export and then choose "Copy to Quick Sale"
Quick Sale should open automatically and show you the import preview screen. Tap Import to import the file.