Gallery doesn't work on folders received as a federated share

[SergioBertolinSG]

Steps to reproduce

1. Having two servers A and B.
2. Using a user from A (userA) share a folder full of pictures with a user from B (userB).
3. Accept the federated share using userB.
4. Using userB go to the folder shared by userA and click on the gallery button.

Expected behaviour

We can show pictures.

Actual behaviour

Album is not available.

Server configuration

Operating system:
Ubuntu 146.04

Web server:
Apache

Database:
MySQL

PHP version:
7.1

ownCloud version: (see ownCloud admin page)
{"installed":true,"maintenance":false,"needsDbUpgrade":false,"version":"10.0.4.2","versionstring":"10.0.4 RC1","edition":"Community","productname":"ownCloud"}

Updated from an older ownCloud or fresh install:
Fresh

The content of config/config.php:

Are you using external storage, if yes which one: local/smb/sftp/...
No.

Are you using encryption:
No

Logs

Client configuration

Browser
Chrome.

Browser Logs

Request URL:HOST/index.php/apps/gallery/files/list?location=SHARED_FOLDER&mediatypes=image%2Fpng%3Bimage%2Fjpeg%3Bimage%2Fgif%3Bimage%2Fx-xbitmap%3Bimage%2Fbmp&features=&etag
Request Method:GET
Status Code:403 Forbidden
Remote Address:151.80.10.237:11039
Referrer Policy:no-referrer

Answer:
{"message":"The owner has placed a restriction or the storage location is unavailable (403)","success":false}

[SergioBertolinSG]

Looks similar to #720

[PVince81]

Hmm, but regular thumbnail previews do work ?

[SergioBertolinSG]

Yes, those work.