Version diff preview for new type extension (mimetype)

Hello everyone,
I have just added a new file extension to my Nextcloud. To do this I created config/mimetypealiases.json using this content :

‘’’
{
“rpy”: [“text/x-python”]
}
‘’’

I then used the commands :
occ maintenance:mimetype:update-js
occ files:scan --all

Almost everything is working fine, I can open the rpy files as python with the file viewer. My issue is that the file versioning comparison can’t show the previous versions. Here is how it looks :

Does anyone know how I can activate the file preview ?
Thank you in advance

Hello @Jinkso ,

welcome to the community of Nextcloud.

You started a topic in support category.
Unfortunately you ignored the template and a lot of information to help you is missing.

Please add all necessary information like Nextcloud version, webserver type and version, os version, related log file content.

Without additional information the community members cannot help you.

Regards,
rakekniven