Don't know if it's just me because something just went wrong with the Embedded Content project or if other people are experiencing the same issues on their project pages as well, but here goes:

When trying to upload new package files to a project the following happens:

1. Message on the page changes to Uploading... (good)
2. First JS popup window says: "An error occured in the upload. Try again later." (bad)
3. Second JS popup window says: "There was a problem with the upload. The server did not accept it." (bad)
4. Message on the page changes to File rejected (bad)
5. Yet reloading the page shows that the package zip file is there in the list and you can download it without any issues (good!), it also appears without issues on the public project page.

I did another test upload with a previous version of the data type which I had already deleted from the project files (aka a package file that uploaded quite nicely about a month ago) and the same issue occured. Did another test run with a random image and choosing 'screenshot', no problem there.

Alright, I thought, file is there, that's te main thing. So go update the project page itself to let it know that the just uploaded version is the latest one and post the changes in the new version.

1. Just opening the edit page and hitting save will result in the YSOD saying I need to set customErrors to Off in order to see details about the error.
2. Modifying the fields on the page and hitting Save will result in the same YSOD, yet the changes will get saved in the backend as the next time I open the edit page the changes have all been made.
3. However, none of the changes actually appear on the public project page...

I'd appreciate it a lot if someone could take a look at this or if anyone could let me know if they've experience the same issue.

Many thanks,

Sascha