[Bugzilla user: s.jodogne@gmail.com]
[Bugzilla date: 2021-08-27T07:29:41+00:00]

Answer from SJO on 2021-08-27:
https://groups.google.com/g/orthanc-users/c/B8-7PUTcmDM/m/K7dG3M_BAAAJ

"From what I understand, the issue is not a problem within the Orthanc core, but an issue with the JavaScript library that is used to upload files from Orthanc Explorer to Orthanc, namely "jQuery File Upload Plugin 5.12":
https://github.com/blueimp/jQuery-File-Upload

This version of the library is very outdated (it is now at version 10.31.0), but upgrading it might raise compatibility issues with the other JavaScript libraries used in Orthanc Explorer.

We are really in the field of this FAQ entry:
https://book.orthanc-server.com/faq/improving-interface.html

I am unsure whether this issue will get fixed before creating a brand new "Orthanc Explorer 2", as the REST API is not affected by this issue and should be preferred in clinical deployments."