Allow to upload pdf files for linkedin

[Daandeve]

🔖 Feature description

LinkedIn carousels work by providing a pdf file unlike instagram carousels, but with postiz I'm not able to upload a pdf file.

🎤 Why is this feature needed ?

Because carousels are very common on LinkedIn it is a great type of post to engage with people

✌️ How do you aim to achieve this?

This feature should only be available for LinkedIn as other platforms do not support this (as far as I know)

🔄️ Additional Information

No response

👀 Have you spent some time to check if this feature request has been raised before?

• [x] I checked and didn't find similar issue

Are you willing to submit PR?

None