@dkocher commented

This most possibly caused by the use of a temporary file to replace the edited file after upload only when the transfer is complete. Refer to Disable upload of temporary file on save.

3ade434 commented

Changing the hidden configuration option did fix it for me.

However, I'm sure other people will have this problem and won't be able to find the solution. I was only able to figure out what was happening because I had the ability to adjust the directory permissions and see the effect. Why does it ever upload a temp file on save? If there is a need for it, perhaps it should try to upload the temp file and if it doesn't work, revert to the other behavior. I think leaving things as-is will frustrate users.

@dkocher commented

Replying to [comment:4 lkmorlan]:

Changing the hidden configuration option did fix it for me.
Thanks for the confirmation.

@dkocher commented

We have this enabled by default as a safeguard procedure for data loss when editing a file and the upload on save would be incomplete because of an I/O failure.

3ade434 commented

I understand.

I notice that even when I was not able to save the file, I could still upload a file of the same name and tell it to overwrite the existing file. So that must not use the temp file. I don't know the details of how to protocol works, but it seems to me that uploading and saving should work the same way.

Another idea: What if you tried to make the temp file in /tmp? Most users have write access to that.

Using rsync might be a good idea for updating files.

@dkocher commented

Replying to [comment:8 lkmorlan]:

I understand.

I notice that even when I was not able to save the file, I could still upload a file of the same name and tell it to overwrite the existing file. So that must not use the temp file. I don't know the details of how to protocol works, but it seems to me that uploading and saving should work the same way.

The use of a temporary filename for uploads is not enabled by default. Refer to Transfers → General → Uploads → Upload with temporary filename.

@dkocher commented

#8982 closed as duplicate.

@dkocher commented

In 19085. The setting in Transfers → General → Uploads → Upload with temporary filename is disabled by default and now used for uploads from editors as well.