Hello,
I recently installed the MediaPress plugin as well as MediaPress Media Moderator on my site.
As a simple member, I cannot upload photos from the activity. I receive an error message:

“x This file type is not allowed in current gallery. Only files are allowed!”

Photos are however authorized in the settings

My configuration:

// Generated by the MediaPress Debug tool //

Multisite: No

SITE_URL: https://tchatpassion.com
HOME_URL: https://tchatpassion.com

WordPress Version: 5.3.2
Permalink Structure: /%postname%/

Active Theme: BuddyBoss Child 1.0.0
Parent Theme: BuddyBoss Child 1.0.0

Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit, request-pending, request-confirmed, request-failed, request-completed

// Browser Details //
Browser Name: Firefox
Browser Version: 73.0
Browser User Agent String: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0
Platform: Windows
// End Browser Section //

PHP Version: 7.4.2
PHP Extensions: Core,date,libxml,openssl,pcre,zlib,bz2,calendar,ctype,hash,filter,ftp,gettext,gmp,SPL,iconv,Reflection,session,standard,SimpleXML,sockets,mbstring,tokenizer,xml,cgi-fcgi,geoip,mysqlnd,bcmath,curl,dba,dom,enchant,fileinfo,gd,imagick,imap,intl,json,ldap,exif,mysqli,odbc,PDO,pdo_mysql,PDO_ODBC,pdo_pgsql,pdo_sqlite,pgsql,Phar,posix,pspell,redis,soap,sodium,sqlite3,sysvmsg,sysvsem,sysvshm,tidy,xmlreader,xmlrpc,xmlwriter,xsl,zip,Zend
OPcache
GD enabled: Yes

//GD Info
GD Version: bundled (2.1.0 compatible)
FreeType Support: 1
FreeType Linkage: with freetype
GIF Read Support: 1
GIF Create Support: 1
JPEG Support: 1
PNG Support: 1
WBMP Support: 1
XPM Support: 1
XBM Support: 1
WebP Support:
BMP Support: 1
TGA Read Support: 1
JIS-mapped Japanese Font Support:
// End GD Info

MySQL Version: 5.5.5-10.0.38-MariaDB-0+deb8u1
Web Server Info: Apache

WordPress Memory Limit: 40M
PHP Safe Mode: No
PHP Memory Limit: 2048M
PHP Upload Max Size: 300M
PHP Post Max Size: 200M
PHP Upload Max Filesize: 300M
PHP Time Limit: 180
PHP Max Input Vars: 1000
PHP Arg Separator: &
PHP Allow URL File Open: No

WP_DEBUG: Disabled
SCRIPT_DEBUG: Disabled

Show On Front: page
Page On Front: (#2)
Page For Posts: (#0)

Session: Disabled
Session Name: PHPSESSID
Cookie Path: /
Save Path:
Use Cookies: On
Use Only Cookies: On

DISPLAY ERRORS: N/A
FSOCKOPEN: Your server supports fsockopen.
cURL: Your server supports cURL.
SOAP Client: Your server has the SOAP Client enabled.
SUHOSIN: Your server does not have SUHOSIN installed.

ACTIVE PLUGINS:

Admin Menu Editor: 1.9.3
Auto Hide Admin Bar: 1.4.1
BuddyBoss Platform: 1.2.7
BuddyBoss Products Updater: 1.2.6
BuddyPress User Badges: 1.0.3
Insert PHP Code Snippet: 1.3.1
Loco Translate: 2.3.1
MediaPress: 1.4.7
MediaPress Media Moderator: 1.0.8
My WP Customize Admin/Frontend: 1.12.2
Post SMTP: 2.0.10
PublishPress Capabilities: 1.9