Upload multiples files to an entry after its creation (and how to add a caption ?)

Questions and Answers
4

Yes, you can add them, in fileInfo:

bodyFormData.append('fileInfo', '{"caption":"caption text","alternativeText":"alternative text"}');

Currently, there is no way to add caption and alternativeText for multiple files, you can send it only for a single file. If you send it with multiple files then only the first one will get them.

I would recommend sending each file individually to the /upload path, something like:

   images.forEach(({ file }) => {
        const bodyFormData = new FormData()
        bodyFormData.append('ref', 'posts')
        bodyFormData.append('refId', postId)
        bodyFormData.append('field', 'images')
        bodyFormData.append(`files`, file)
        bodyFormData.append('fileInfo', `{"caption":"${file.caption}","alternativeText":"${file.alternativeText}","name":"${file.name}"}`);
        client.post('/upload', bodyFormData)
    })
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