Cual Formato de archivo subir

As of the vector submission requirements:

2. As a ZIP folder (AI and EPS formats only) 

Folder submissions include only:

●    AI or EPS vector file (when saving, make sure Create PDF Compatible File)

●    JPEG preview file minimum size 2048 x 1424px Nb: this is nonsense if the JPEG file needs to be 15MP!

●    Folder size: Minimum 4MB (???) - Maximum 100MB

To generate a JPEG preview image in Adobe Illustrator: 

●    Go to File ➞ Document Colour Mode ➞ RGB colour

●    Go to File ➞ Export ➞ Save for web

●    Preset: JPEG, Maximum, Quality 100%

●    Image Size: Insert the required size (Minimum file size 15MP)

●    Save to folder with .ai file

You are right, the indications are confusing! I would suggest always to generate the own preview as somehow the colours of the auto-generated preview by Adobe are not accurate. Anyhow, this works for me...