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Piloting experiment | experiment designer: undefined

URL of experiment:

Description of the problem:
I have an experiment in PsychoPy Builder that I have synch online, thus creating an online project/experiment, locally the experiment works fine.
Online I can see the folder structure and the ‘html’ and ‘js’ files, in addition to the ‘resources’ folder with the correct files, when I try to ‘pilot’ it I get the following message:

We could not find a record for experiment designer: undefined
Please check the name and try again. If the error persists, contact Pavlovia’s administrator.

I have a suspicion that it could be because it uses around 500Mb of video files (each video weights around 5-8M). What could be the issue and how can I solve it?

I have seen this problem described in some posts in the forum but never seen it addressed as clearly solved