The PDF attachment cannot be displayed if the file extension is in uppercase.

[StefInP]

Steps to reproduce

1. Receiving an email with a PDF attachment whose file extension is in uppercase (*.PDF)
2. Try to open the attachment : Nothing happens

This behavior occurs from the message list or the message view.
No problem with lowercase file extensions (*.pdf).

Expected behavior

The PDF file should open.

Actual behavior

See above steps to reproduce.

Mail app version

5.7.15

Nextcloud version

33.0.3

Mailserver or service

Mailo

Operating system

Linux 6.12.86+deb13-cloud-amd64 x86_64

PHP engine version

PHP 8.3

Nextcloud memory caching

No response

Web server

Apache (supported)

Database

PostgreSQL

Additional info

Instance AIO 13.0.3