For the Brave 4, please use brand name memory cards that meet these requirements:
• Class 10 or UHS-I rating
• Capacity up to 64GB, The bigger memory may have an effect on the compatibility with the camera.
1. Please format the microSD card first in this camera before using it. To keep your microSD card in good condition, reformat it on a regular basis. Reformatting erases all of your content, so be sure to offload your photos and videos first.
2. FAT32 format microSD card stops recording when the storage of each file is over 4GB and starts to record again on a new file.