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hi dear pablo.
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i have a form include several File Upload . How can is Set Maximum File Size Support For Each File Upload ? in validate Setting I can just Set File My own File Type . so i need to set Maximum File size for each them .
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i mean File Upload Field In form - no File Upload Extension

You can set the maximum size in the properties of the form.
See also the notes about this in the help.

so i need to set Maximum File size for each them

As Pablos reply but also note your hosting provider may have a file size restriction which is unrelated to what you can set in the form.