sorry, I forgot to add: we switched to a different server ( https://userpage.fu-berlin.de/jonesanam/audios/saveRecordings.php ). The things I said in my last comment apply to the new server. When I try to open that link (or the parent directory), i get error messages. Does that mean our issue lies probably within the server? When trying to open the image directory ( https://userpage.fu-berlin.de/jonesanam/stimuli/ ), i also get an error message (however, displaying these in ibex works just fine).
Thank you for the explanation with the upload trials, too! 🙂