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You should look at our Location Map feature which is designed to easily stack multiple visits to the same location:
https://support.dronesmadeeasy.com/hc/en-us/articles/207455313-Creating-a-Location-Map
If you are going to process data from multiple days a the same time make sure that the lighting and shadows are similar and that there is at least 2-3 passes of overlap between the adjacent sections.