INFORMATION: Sorry but you can't add directly medias from V3 software on demo galleries. Please send an email to the support so they upgrade this event. Then you will be able to add medias from this event.
About Export options... Which one do I choose ?
Export (csv) is standard export for most of all spreadsheet softwares.
Export (csv - ; separated) is french exception. If you have a french laptop, this export option may be more suitable.