Yesterday I unpacked two brand new V3 Cameras, updated the firmware to the latest one, inserted SD cards in both, formatted and… experiencing exactly the issue you guys reported.
In both two V3 cameras (no cam plus plan, only SD recording):
1.the SD cards are visible and formatted properly, size is reported correctly.
2.The recording timeline is available (live stream → view playback) and reports recordings correctly, replays the recordings etc.
3. However, when you try to access the specific recording from the specific EVENT (events → [video preview] → PLAYBACK) the app says “MicroSD Card Not Found”
This is a serious bug which affect the overall app usability, needs to be fixed ASAP.