when I was using phpstorm, I encountered the error of could not list the contents of folder. Using external FTP tools, I could connect to the server normally, but not on phpstorm. After struggling for a long time, I found the following content on phpstorm’s official website

PhpStorm seems to connect to the server but can’t list files or perform upload

This may be because the deployment server requires a so-called passive FTP connection. To set this mode, select Project Settings | Deployment, open Advanced Settings for the server and toggle Passive mode.
Limiting the number of concurrent FTP connections may also help in this situation. To do this, select Project Settings | Deployment, open Advanced Settings for the server and toggle Limit concurrent connections mode setting the number of connections (usually 3-5 concurrent connections is OK for any server if you experience problems with a higher number of connections).

A link to visit is attached:
http://confluence.jetbrains.com/display/PhpStorm/Troubleshooting

The translation means:

Phpstorm appears to be connected to the server, but cannot list files or perform uploads

this may be because the deployment server requires a so-called passive FTP connection. To set this mode, select project settings | deployment, find and open advanced settings, and select passive mode.
limiting the number of concurrent FTP connections also helps. To do this, select project settings | deployment, set the number of connections for the server and switch the limited concurrent connection mode, and open advanced settings (usually 3-5 concurrent connections can be for any server if you have a higher number of connections).

In this way, try to use the above solution.
open the server configuration interface tools & gt; deployment & gt; configuration, and then on the interface, find the advanced settings button, open it, check the passive mode option, and then OK

Test again, you can upload normally.
It seems that if you have a problem, you should first check the official documents~