Lychee photo import fails

[txd]

My YunoHost server

Hardware: VPS bought online
**YunoHost version:**4.2.4 (stable).
I have access to my server : Through SSH | through the webadmin |
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

I’m trying to import some photos into Lychee app, it fails.
It tells me to check the log, I’ve got this error :
2021-05-20 12:07:43 – error – App\Metadata\Extractor::extract – 118 – explode() expects parameter 2 to be string, array given

I don’t understand what to do to fix this, if someone has an idea it would be great
Thanks for any help
Best Regards

Thibault

[txd]

Further more my browser console returns :
/photo/api/Photo::add:1 Failed to load resource: the server responded with a status of 504 ()

main.js?1605824845:4641

1. Object

2. description: “Upload failed. Server returned an unkown error!”

3. params: XMLHttpRequest {onreadystatechange: null, readyState: 4, timeout: 0, withCredentials: false, upload: XMLHttpRequestUpload, …}

4. response: “”

5. proto: Object