Download longer video's

Why can’t i download the longer video’s from my indoor cam Eufy???
I can’t download clips on my iOS or MacOS app?? If i select a day in the calendar where the video is stored, it says 'No data??? Only visible are the clips. The only way is playing the video in the (iOS)app, record it (button on the richt bottom) and save that clip. But the video quality is than ruined . SD-card is cripted, so that’s a NoGo to! Heeelllllpppp!