In Google Drive in English, "Import" has a separate meaning: bringing the content from an existing document (such as an Excel Spreadsheet) into a Google document. I don't know why the French version labels upload thusly, but as I'm sure you are aware, language translation is a complicated issue. Words don't map one-to-one between languages, and usage often differs.
There is a sticky underlying issue, here, though: up and down arrows are idiomatic for two different functions: upload/download and export/import.
In the context of Google Drive, an import operation is also an upload operation. Using a down arrow for import would likely create confusion.
In an internet-related context, I would suggest reserving up and down arrows for upload and download (since the symbol is much more closely related to the words), and coming up with something else for import and export.