API to download & upload attached files

Hello,

We've been working on using the Projeqtor API for some specific use cases. One thing we'd like to offer is the possibility to upload or download attached files.

We had some internal tests succeed by directly calling Projeqtor files (e.g. saveAttachment.php or download.php).
However when calling these files from an API connection, the application security check flags these calls as an "ERROR - hacking attempt".

Is there some way to upload / download attached files through API calls ?

Thanks!