Hi Emiel,
Yes, it would be along the lines of the solutions you point to. So something like:
const replaceUploadingMessage = ()=>{
const uploadingMessage = $(".PennController-PennController > p");
if (uploadingMessage.length > 0 && uploadingMessage[0].innerHTML.match(/^Please wait while the archive of your recordings is being uploaded to the server/))
uploadingMessage.html("Please wait");
window.requestAnimationFrame( replaceUploadingMessage );
};
window.requestAnimationFrame( replaceUploadingMessage );
Also consider uploading recordings trial by trial
Jeremy