If I insert an image into a learning object, I upload the file and choose it.

The "Image URL" is the following:

http://lms.xyzl.de/doceboCore/addons/mod_media/../../../files/common/users/1406_68_1237976398_schritt2.jpg

After clicking the button "Update", the image is shown correctly. But if I save the changing the image is gone.
If I change the "Image URL" in ../files/common/users/1406_68_1237976398_schritt2.jpg (only the last part of this which is set automatically) it works.

Where do I have to change a path or something else that the "Image URL" is set correctly by Docebo?