Add error notification when lacking the upload permission

langs/en-ca.json

@@ -22,7 +22,8 @@
 		"notifs": {
 			"error": {
 				"db-out-of-date": "Database out of date, please try again.",
-				"document-ID-404": "Cannot find {dbType} with ID: {id}"
+				"document-ID-404": "Cannot find {dbType} with ID: {id}",
+				"no-upload-permission": "Cannot save due to missing the \"Upload Files\" permission."
 			}
 		}
 	}

module/apps/mixins/DBConnector.mjs

@@ -69,6 +69,14 @@ export function DBConnectorMixin(HandlebarsApp) {
 		};
 
 		async isAbleToSave() {
+			if (!game.user.can(`FILES_UPLOAD`)) {
+				ui.notifications.error(
+					`TB.notifs.error.no-upload-permission`,
+					{ localize: true },
+				);
+				return false;
+			};
+
 			if (!this._docID) { return true };
 
 			const newLastModified = await lastModifiedAt(this.dbPath);