Can't upload files of my website!

Website URL

https://Loco81.ir

Error Message

When I’m trying to update index.php (by upload), it shows an error pop-up and i can’t upload my file. Error: Script file validation failed: potentially dangerous code pattern detected in php file.
I uploaded the same index.php file few days ago and did not get error. Now just changed one of my site buttons link (href) and can’t upload new file. please help

Other Information

Also can’t upload js (file type is not allowed: js) and css files!

Hello, and Welcome back to the InfinityFree Forum @LoCo81! It’s been 5 months since we have seen you!

Have you tried uploading the files via FTP instead of the file manager on your site?

Hi..

No, will that method solve the problem?

Using an FTP client is the recommended method as the file manager is buggy

How can i use it?