diff --git a/scripts/_common.sh b/scripts/_common.sh
index bfde399..83aa435 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -89,6 +89,21 @@ myynh_remove_fpm_config () {
 	sudo systemctl restart php5-fpm
 }
 
+# Update the according fo filesize
+myynh_update_bozon_auto_dropzone () {
+	case ${filesize: -1} in
+		g|G)
+			max_length=$((${filesize%?}*1024))
+			;;
+		*)
+			max_length=${filesize%?}
+			;;
+	esac
+	if [ -e "$bozon_auto_dropzone_php" ];then
+		ynh_replace_string "'max_length'=>2048" "'max_length'=>$max_length" "$bozon_auto_dropzone_php"
+	fi
+}
+
 #=================================================
 # FUTURE YUNOHOST HELPERS - TO BE REMOVED LATER
 #=================================================
diff --git a/scripts/install b/scripts/install
index adbeb9b..6b328fa 100644
--- a/scripts/install
+++ b/scripts/install
@@ -21,6 +21,7 @@ backup_core_only=$YNH_APP_ARG_BACKUP_CORE_ONLY
 final_path="/var/www/$app"
 data_path="/home/yunohost.app/$app"
 bozon_conf="$final_path/config.php"
+bozon_auto_dropzone_php="$final_path/core/auto_dropzone.php"
 nginx_conf="/etc/nginx/conf.d/$domain.d/$app.conf"
 phpfpm_conf="/etc/php5/fpm/pool.d/$app.conf"
 
@@ -66,6 +67,9 @@ sudo mv "$TMPDIR" "$final_path"
 ynh_replace_string "default_language='en'" "default_language='$language'" "$bozon_conf"
 ynh_store_file_checksum "$bozon_conf"
 
+# update auto_dropzone.php
+myynh_update_bozon_auto_dropzone
+
 # create private & data folders
 myynh_create_dir "$final_path/private"
 myynh_create_dir "$data_path/uploads"
diff --git a/scripts/upgrade b/scripts/upgrade
index 916176d..a024b5e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -20,6 +20,7 @@ backup_core_only=$(ynh_app_setting_get "$app" backup_core_only)
 final_path="/var/www/$app"
 data_path="/home/yunohost.app/$app"
 bozon_conf="$final_path/config.php"
+bozon_auto_dropzone_php="$final_path/core/auto_dropzone.php"
 nginx_conf="/etc/nginx/conf.d/$domain.d/$app.conf"
 phpfpm_conf="/etc/php5/fpm/pool.d/$app.conf"
 
@@ -73,6 +74,9 @@ fi
 sudo cp -a "$TMPDIR/." "$final_path"
 sudo rm -R "$TMPDIR"
 
+# update auto_dropzone.php
+myynh_update_bozon_auto_dropzone
+
 # set permissions
 myynh_set_permissions