If you have an error containing "Received Too Large SFTP Packet" or "Server sent command exit status 127", you can try this method

First select the SCP file protocol in the select menu as seen on image below. Then click Advance. On Advance > SCP/Shell Shell:, select sudo su - as seen on image below.

This will take a long time to authenticate. After authentication, you can edit your file or change permission.

Did you read the documentation for the error message?
Received too large (… B) SFTP packet. Max supported packet size is 102400 B

Using Microsoft Azure, logging in with root I get this error:

Received too large SFTP packet