Whilst trying to understand how I could upgrade to php7.2-intl on server as suggested by eneubauer I found in my server nginx log these error for each file failing on the oc-client
2020/01/15 16:28:18 [error] 5503#5503: *20947 client intended to send too large body: 1234056 bytes, client: 192.168.1.105, server: awsbarker.ddns.net, request: “PUT /owncloud/remote.php/dav/files/Andrew/Fan/Washer%20Fan_files/c9HGBK0bHVQ_data/base.js HTTP/2.0”, host: “awsbarker.ddns.net”
I’d forgotten (!?) that I have nginx infront of apache and I guess I need to increase the nginx config client_max_body_size >512mb;
I’ll get back once done and verified as the problem.