Add preview function

[zylinzzz]

What type of request is this?

New feature idea

Clear and concise description of the feature you are proposing

Is that possible to add a preview function that allows recipients to view photos and PDFs without downloading them? It would be great if downloading could be disabled after previewing.

Additional context

No response

Validations

• Check the feature is not already implemented in the project.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Check that the feature is technically feasible and aligns with the project's goals.