Hello David,
In @hervema problem we use VPS with Plesk panel 12.5 (Apache+Mysql+PHP-FPM7) and have this errors when we try to upload files:
1. POST /wp-admin/async-upload.php HTTP/1.1
2. PHP Fatal error: Uncaught Error: Call to undefined function bp_docs_get_associated_group_id() in /var/www/vhosts/site7/httpdocs/wp-content/plugins/buddypress-docs/includes/functions.php:573\nStack trace:\n#0 /var/www/vhosts/site7/httpdocs/wp-content/plugins/buddypress-docs/includes/functions.php(446): bp_docs_get_default_access_options(943, 0)\n#1 /var/www/vhosts/site7/httpdocs/wp-content/plugins/buddypress-docs/includes/attachments.php(269): bp_docs_get_doc_settings(943)\n#2 /var/www/vhosts/site7/httpdocs/wp-content/plugins/buddypress-docs/includes/attachments.php(192): BP_Docs_Attachments->get_is_private()\n#3 /var/www/vhosts/site7/httpdocs/wp-includes/plugin.php(235): BP_Docs_Attachments->maybe_create_rewrites(Array)\n#4 /var/www/vhosts/site7/httpdocs/wp-admin/includes/file.php(246): apply_filters(‘wp_handle_uploa…’, Array)\n#5 /var/www/vhosts/site7/httpdocs/wp-admin/includes/file.php(429): _wp_handle_upload(Ar…\n’, referer: https://site7/docs/create/