Don't update attachment item for client uploads when file exists, either
Don't update attachment item for client uploads when file exists, either

grumbelbart/zotero_dataserver_sualk,grumbelbart/zotero_dataserver_sualk,zebulon2/dataserver,grumbelbart/zotero_dataserver_sualk,grumbelbart/zotero_dataserver_sualk,zebulon2/dataserver,zebulon2/dataserver,zebulon2/dataserver