Official comment
I am not super sure what you are describing here. Is this a data collection issue or an issue with uploading your images?
The DJI Specific workflow does filter out images that are more than 45 degrees above nadir since they will likely include the horizon which is forbidden.
For every job you process with Maps Made Easy you need to upload all of the images in one shot. There are two step: selection and uploading. It sounds like you had only selected the images anyway. You just need to select all of them at once and all of the files need to be uniquely named.
In general, the Mavic Air isn't really suited to doing any type of professional mapping. The M200, on the other hand, is excellent.