WinSCP gives a '/tmp' directory error while saving a changed file

Even when I'm logged in as a root user to my remote Ubuntu22.04 server thru WinSCP 6.1.2, I get this error when I save a changed file (even though I found that the changes made by me are saved in that file, but these errors irritate).
See the screen shot here: https://i.stack.imgur.com/egbR0.png
The contents of the error (also showing partially in the attached screen shot) are:

General failure (server should provide error description).
Error code: 4
Error message from server: Failure

Common reasons for the Error code 4 are:
- Renaming a file to a name of already existing file.
- Creating a directory that already exists.
- Moving a remote file to a different filesystem (HDD).
- Uploading a file to a full filesystem (HDD).
- Exceeding a user disk quota.

I've not been able to find the option of 'Moving files to Recycle Bin' in WinSCP settings.

Your duplicate post on Super User:
WinSCP gives a '/tmp' directory error while saving a changed file

And I got the solution there. So thanks again.

I've WinSCP installed in Windows 11.
When I login to remote Ubuntu server, and turn on the option to use the 'Temp' folder as the 'Recycle Bin', and delete a file, it starts giving "Error 4: Server Failure" or something like that.
As far as I read, it is due to diff file systems in my local PC and remote Ubuntu.
Is there any solution to this problem, if I wanted to use Recycle bin on remote Ubuntu server?

@BathindaHelper: No, it's probably because the remote file you are deleting is on a different file system than the /tmp. You have to configure the recycle bin to be on the same file system as the remote files you are working with.

Can you pls guide me how can I create the recycle bin folder on the same remote server (on which I'm suppose to delete some file).

That's system-dependent. If you use Linux, I use df command to see the roots of the file systems:
How to get the complete and exact list of mounted filesystems in Linux?
Find out the root of the system of the files you are working with. And create the recycle bin folder somewhere within the same root.

I created the /tmp folder in my remote linux server (actually it was already there) and in the site preferences I gave the path to recycle bin as /tmp.
But still I get the same error as mentioned in earlier/OP.

See attached screenshot.