Can't upload PDF files in lessons

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When i try to create a new lesson that has a file attached ( a .pdf file) and press the "Save" or "Save and quit" button it redirects me to the Dashboard. The lesson is created with all the settings that i selected, but with no file attached. I have tried all categories from the "content type" tab but the .pdf files are still not accepted. It seems that it works with .docx files.

Are .pdf files really not supported or is it just a bug for me?