Background:
I am experiencing issues with the downloader software (Aria2 and Transmission) on my Mudi GL-E750-V2 router. Below is the detailed information regarding the problem.
Details:
When I start up Aria2, it shows the following message:
Successfully connected to Aria2 through remote RPC. However, the connection is still insecure. For complete security, try adding an authorization secret token while starting Aria2 (through the flag-rpc-secret).

Despite this, both the web UI and other interfaces have been tried, resulting in the same error message: "download was unsuccessful." When accessing the web interface, it indicates that the settings to USB and SD Card are correct and connected. In LuCI, it also shows as working correctly. However, every time I input an HTML link or torrent file into Aria2, it shows "download was successful" after a few seconds, but the download does not actually work.
I have tried troubleshooting for the past two months, including resetting the machine and starting over, but the issue persists.
Error Message:
Download was unsuccessful

Technical and Firmware Information:
- Product Model: GL-E750V2
- Firmware Version: 4.0
- Firmware Type: 0317release2
- Compile Time: 2024-06-07 7:46:06 (UTC+08:00)
- OpenWrt Version: 22.03.4 r20123-38ccc47687
- Kernel Version: 5.10.176
Could you please provide assistance in resolving this issue?
Thank you very much.