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About your second question: S3 settings. You can provide them by using additional_params:
fpfile = django_filepicker.models.FPFileField(additional_params={
'data-fp-option-services': 'COMPUTER, GMAIL, FACEBOOK',
'data-fp-store-location': 'S3',
'data-fp-store-path': 'some_folder',
})
Here are more possible values you may find in there https://developers.filepicker.io/docs/web/#widgets in the section additional_params
Source:stackexchange.com