It turned out that the issue was caused by my network environment. Somehow my network environment was throttled and led to the issue. Changing to a better network environment made it work.
However, when I tried to upload even larger artifacts in a row (around 200MB for each), it failed due to the failure of livenessprob and readinessprob of fileserver pod. By default, the timeout of the two probes is 1s. I increased the timeout to 100s and that fixed the issue. @<1523701827080556544:profile|JuicyFox94> @<1523701087100473344:profile|SuccessfulKoala55>