files attached not receiving (transformed on mail)

Hy,

I have a problem with contact form on my website for files attached. when we don’t have files attached on the form, no problem with mail received but when we test witi file attached, we receive the mail with error and not file attached.

do you have idea of the problem? we have the latest version of contact form

example of mail received

boundary=”b1_a9a6287b6b226eaff344a101f79cfdcd”
Content-Transfer-Encoding: 8bit
This is a multi-part message in MIME format.
boundary=”b1_a9a6287b6b226eaff344a101f79cfdcd”
Content-Transfer-Encoding: 8bit
This is a multi-part message in MIME format.

–b1_a9a6287b6b226eaff344a101f79cfdcd
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Objet? : test envoi avec pj

INFOS :
Club : test
Statut : Je suis un club sportif
Disciplines : Cheers

DEMANDE :
des informations

MESSAGE :
test envoi 11:30 avec pj en jpg

—
Cet e-mail a ??t?? envoy?? via le formulaire de contact de SPORT ACADEMY (https://www.sportacademy.fr)

–b1_a9a6287b6b226eaff344a101f79cfdcd
Content-Type: image/jpeg; name=”artoff1226.jpg”
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=artoff1226.jpg
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…….

The page I need help with: [log in to see the link]