issue #827 provide backward compatibility for album links generated in earlier times before the ambiguity of photo album names was solved. This may provide incorrect results if two or more photo albums with the same basename exist in different directories of the file tree; but there is no easy way to solve that ambiguity - which is why the link format changed.

Zotlabs/Module/Photos.php

@@ -689,7 +689,7 @@ class Photos extends \Zotlabs\Web\Controller {
 					(SELECT resource_id, max(imgscale) imgscale FROM photo left join attach on folder = '%s' and photo.resource_id = attach.hash WHERE attach.uid = %d AND imgscale <= 4 AND photo_usage IN ( %d, %d ) and is_nsfw = %d $sql_extra GROUP BY resource_id) ph 
 					ON (p.resource_id = ph.resource_id AND p.imgscale = ph.imgscale)
 				ORDER BY created $order LIMIT %d OFFSET %d",
-				dbesc($datum),
+				dbesc($x['hash']),
 				intval($owner_uid),
 				intval(PHOTO_NORMAL),
 				intval(PHOTO_PROFILE),

include/photos.php

@@ -593,6 +593,15 @@ function photos_album_exists($channel_id, $observer_hash, $album) {
 		intval($channel_id)
 	);
 
+	// partial backward compatibility with Hubzilla < 2.4 when we used the filename only 
+	// (ambiguous which would get chosen if you had two albums of the same name in different directories)
+	if(!$r) {
+		$r = q("SELECT folder, hash, is_dir, filename, os_path, display_path FROM attach WHERE filename = '%s' AND is_dir = 1 AND uid = %d $sql_extra limit 1",
+			dbesc(hex2bin($album)),
+			intval($channel_id)
+		);
+	}
+
 	return (($r) ? $r[0] : false);
 }