Cannot import photos from my mobile camera roll anymore

Hi,
Is there a limit in terms of how many pictures you can import from your mobile camera roll into you LR mobile app?
all of the sudden the import photos function was no longer available, it would only allow me to select videos to import but no longer the photos.
Could it be linked to a limitation of the number of photos you are allowed in the LR free app? Or could it be linked if my iCloud is full?
Thank you for you help
Gaëlle
