This issue can be tested in Android or iOS (it doesn't require to be tested in both systems) Login into the app and go to User menu > Files. Long press the icon of any file. It should transform every icon into a checkbox and the header should count how many files has selected by the user. Select one or multiple files and remove them by pressing the "Trash" icon of the top right corner. Download files now is the "Available offline" toggle from the options menu of the file (3 dots icon), so if you check it, the file will be available offline and if you uncheck it will be removed from the user device. Delete an offline file individually using the options menu of the file, pressing "Delete".