The File field allows users to upload a file with their form submission. Additionally, you can limit which filetypes a user may upload via the formats setting.
To learn about the common settings that are applicable to all field types kindly refer to field settings doc
Below you will find details of additional settings that are particular to this field.
Besides the common settings, there are a few additional settings that are available for this field type only. These settings can be found under the "Field Settings" panel.
Allowed Formats - You can limit the format that a user can upload using this option. By default all the available formats are added, you can remove all other formats than those you like to allow.