Offizieller Kommentar
Some DJI aircraft number their images with 3 digits and some do it with 4. The 3 digit versions certainly make it a bit harder to do larger maps.
This is covered a few times here in the forums:
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360001005763-More-than-1000-images-
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360048203712-999-picture-maps