Can photos taken directly from Fujifilm gfx100s be transferred directly to WeChat?

No

WeChat cannot be transmitted directly and needs to be compressed again.

You can first transfer the photos from the digital camera to the computer using a data cable, then connect the phone to the computer, and then transfer the photos to the phone. In this way, the photos in the digital camera are transferred to the mobile phone. You can select the photos you want to export on your mobile phone, or you can choose your mobile phone to control the camera to take selfies, which is super convenient. Although Fujifilm’s APP has been criticized wildly for its slow transmission speed, I think it’s pretty good. Super convenient! It’s very useful especially when you don’t have a card reader with you or when you want to take beautiful photos right away.