Hi @cindy.wang,
- Basemaps not displaying
Pix4D software uses Mapbox as a basemap provider. Mapbox will shut down its Legacy Static tiles API 9 as of November 1st, 2020. Hence, the current and previous version, which uses the older API will have issues with the basemap. More in the Mapbox basemap issue with older versions of Pix4D’s software community post.
The best solution is to update the software to the latest version (4.6.3) here.
- Image folders
If the image names are unique, then you can simply copy them into one folder and process the project as per normal. Even if you keep images in separate folders and import them for processing it should work fine.
As a side note, we developed a new desktop application Pix4Dmatic that is optimized for large scale projects. It is designed to handle and process thousands of images with ease while maintaining survey-grade accuracy.
Feel free to download it and try it out.
Best,