What permission for Edit/View File

[dungqa98]

I just disabled only user's Delete File permission. But user cant edit file via view/edit on FileZilla Client and Server send 550 Permission denied. Error: Critical file transfer error
How can I set permission for user can view/edit but not delete files ?

[botg]

Outdated versions of FileZilla Server are not supported.

Note that changing a file results in the old content no longer being available, it is as if it were deleted.