Is there a way to add a file type in "Restrict file types" list for the "Attachement Field"?

[sanderquirynen]

Is there a way to add a file type in "Restrict file types" list for the "Attachement Field"?
If for example you would like to limit attachments to types like .pdf, .docx, .xlxs

[sanderquirynen]

Answer from @alexander-schranz on Slack channel:

The restriction is currently based on exist types of sulu media (video, audio, image, documents).

Solution 1
You could workaround your problem by validating the type in the frontend by adding in your custom form theme <input accept="my_mime_type" to the file upload input.

Solution 2:
You could also decorate the exist AttachmentType services: https://github.com/sulu/SuluFormBundle/blob/2.x/Dynamic/Types/AttachmentType.php

[niklasnatter]

Thanks a lot for making the answer discoverable for others! 🙂