Problem when uploading file via webdav with drag and drop

WinSCP opens in explorer mode and connects to my nextcloud via webdav.
The problem occurs if I drag a file in windows explorer and drop it into the WinSCP window.
WinSCP starts the uploading and than transfers 0 Bytes. No error message is shown, so you do not know that the upload fails.
If I repeat the operation, the upload mostly succeed.
What is the reason for that behaviour? Can I solve the problem by myself by configuring WinSCP?

Please attach a full session log file showing the problem (using the latest version of WinSCP).

I have took a screenshot showing the problem in the WinSCP program window.
Also, I attached the textual log file.
Greetings
Christian

I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Now, I have tried with the debug version. First, thank you for this!
I get the assertion attached to this reply when dropping a file in WinSCP in a WebDAV folder.
After click OK in the assertion dialog another dialog with "Abnormal termination" appears and WinSCP closes.

I hope this is helpful to find the error!

Greets
Christian

martin wrote:

I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Thanks for the logs.
The file you are uploading is in a temporary folder. Are you sure you are really dragging it from Windows Explorer? Can you post a screenshot of the window, where you drag the file from?