Click the Folder icon on the upper-right of the chat screen where the file has been uploaded,
and you can view and confirm the files uploaded to the chat.

Move the cursor over the file you want to delete to display it and click the Trash Bin icon. A confirmation screen will open, and you can delete the file with the [Delete file] button.




Also, if you open the "Files" at the upper-right of the chat screen, move the cursor over the file you want to delete, and click the Trash Bin icon, a confirmation screen will be displayed, and you can delete the file with the [Delete file] button.

Additionally, when a file has been uploaded, if you click "Delete" on the message posted from the system, a confirmation screen will be displayed, and you can also delete files by checking the "Remove attached file from file management" checkbox.