Documents that usually accompany the diploma
A diploma and transcript rarely travel alone in a French admission file. Depending on the program and admission route (Études en France, direct university admission, or a dual-degree process), the complete package can also include a letter of motivation, an academic CV, proof of French or English proficiency depending on the program's language of instruction, and evidence of financial means for the student visa application at the consulate. Each of these additional documents may carry its own format and translation requirement, distinct from what applies to the diploma, so it's worth checking them separately against the university's or Campus France's checklist rather than assuming the whole file follows one single rule.
Plan with enough lead time
Assembling a complete academic file for France usually involves several sequential steps: contacting the registrar at your U.S. university, obtaining the certified copy, processing the state apostille when required, commissioning the professional translation, and finally uploading everything to the Campus France platform or sending it directly to the university. Each step depends on the one before it, and response times from university offices, state authorities and translators vary and can't be guaranteed in advance. That's why it's worth starting the process as far ahead of the application deadline as possible, rather than waiting for a conditional admission response before moving the first document.
Illustrative example: an applicant apostilles their diploma thinking that resolves the whole file, but Campus France or the university also requires a professional translation that meets a particular format or translator-identification requirement, and their usual translator can't certify it that way. The result is that the translation, not the apostille, has to be redone before the file is considered complete. Confirming the exact translation format before commissioning it avoids this kind of rework.