It depends on the hosting capabilities. If you use hosting built into the constructor, then wait for a response from the official support, and if you have a third-party hosting, then ask a question there.

thank you for answer.

we use Virtual Private Server, Alma Linux OS,C Panel

and able to attach 200 MB for each email conversation,

but

unable to attach any file more then 2MB trough Contact form object.

if So receiving messages without atachment. or " You must activate JavaScript " report.

who is limiting ? 

trying to find.

Solution already found by our own afford

PHP INI files in server limiting,

here is the solution:

inside web server

1. Navigate to "MultiPHP INI Editor"
2. Select the version of PHP that your site uses
3. Increase the following variables

1. upload_max_filesize
2. post_max_size (This should be larger than or equal to upload_max_filesize)
3. memory_limit (This should be larger than or equal to post_max_size)
4. max_execution_time (Optional, but can prevent timeout errors for large files)
5. Click "Apply"