Alternate site for Site Sync doesn't work for sequences
 It seems that only first file in a sequence is marked with alternate site.

[cuID:1u46jz8]
diff --git a/openpype/modules/default_modules/sync_server/providers/sftp.py b/openpype/modules/default_modules/sync_server/providers/sftp.py
index 3390cd5d3d..1585b326bd 100644
--- a/openpype/modules/default_modules/sync_server/providers/sftp.py
+++ b/openpype/modules/default_modules/sync_server/providers/sftp.py
@@ -421,7 +421,8 @@ class SFTPHandler(AbstractProvider):
 
         try:
             return pysftp.Connection(**conn_params)
-        except paramiko.ssh_exception.SSHException:
+        except (paramiko.ssh_exception.SSHException,
+                pysftp.exceptions.ConnectionException):
             log.warning("Couldn't connect", exc_info=True)
 
     def _mark_progress(self, collection, file, representation, server, site,
diff --git a/openpype/modules/default_modules/sync_server/sync_server_module.py b/openpype/modules/default_modules/sync_server/sync_server_module.py
index cd29d93384..500203f3fc 100644
--- a/openpype/modules/default_modules/sync_server/sync_server_module.py
+++ b/openpype/modules/default_modules/sync_server/sync_server_module.py
@@ -1574,6 +1574,7 @@ class SyncServerModule(OpenPypeModule, ITrayModule):
 
             Use 'force' to remove existing or raises ValueError
         """
+        reseted_existing = False
         for repre_file in representation.pop().get("files"):
             if file_id and file_id != repre_file["_id"]:
                 continue
@@ -1584,12 +1585,15 @@ class SyncServerModule(OpenPypeModule, ITrayModule):
                         self._reset_site_for_file(collection, query,
                                                   elem, repre_file["_id"],
                                                   site_name)
-                        return
+                        reseted_existing = True
                     else:
                         msg = "Site {} already present".format(site_name)
                         log.info(msg)
                         raise ValueError(msg)
 
+        if reseted_existing:
+            return
+
         if not file_id:
             update = {
                 "$push": {"files.$[].sites": elem}
['openpype/modules/default_modules/sync_server/providers/sftp.py', 'openpype/modules/default_modules/sync_server/sync_server_module.py']