Exporting local knowledge base and importing in the web version results in missing images in image occlusions

How to export files containing images and image occlusion from my knowledge base to my account to sync with other devices and make those pictures and image occlusions appear as they just appear as white images with blue rectangles

I wanna know why when I export file from my knowlage base in local storage containing images and image occlusion from remnote in Json form (remnote form) and then import this file to my remnote account to sync with other devices these images and image occlusion doesn’t appear and just appear a white picture with blue rectangles where the occlusion was