Gert
If you create a folder in the html folder of an ibay e.g /home/e-smith/files/ibays/<ibayname>/html/files you will not be able to access it from the web.
That's because when you try to access
http:/yourdomain/ibayname/files
it preferentially looks in
/home/e-smith/files/ibays/ibayname/files
ie .../ibayname/files takes precedent over ..../ibayname/html/files
To overcome this issue i have created a folder in the "html" folder and copied the files and folders for concrete5 in it, instead of just in the "html" folder and now it works fine. but now my website url is www.mydomain.com/folder instead of just www.mydomain.com
You could move/install the app to /opt/concrete5 and change the alias and other config to suit
or
You could move the content in
/home/e-smith/files/ibays/ibayname/html/files
to
/home/e-smith/files/ibays/ibayname/files
although I'm not sure if that would work.
You may need to fiddle with absolute path settings in the apps config files