http error after upload

[piers]

Please help.
I am running joomla 3.9.8
php 7.3.6
mysql 5.5.5-10.2.21-MariaDB

Jdownloads version 3.2.64

When i upload a file in the backend I am getting HTTP Error.

Cache is off.

[ColinM]

Hi
can you download OK?How are you uploading and where are you putting the file?If you go to jD Config - Downloads tab are all the directories shown as writable?
Are the contents of field "Upload directory path" OK. 
It should be like the setting in the Joomla! Global Config - System Tab -Path to Log Folder except having jdownloads rather than log
Colin