1.4. Which data formats and protocols are supported in Web GIS
Raster - GeoTIFF (standard raster style supports files with 3 or 4 bands, RGB or RGBA, for other types you can use QGIS style);
Use NextGIS Connect if you need to upload data in other formats.
Web GIS also allows to connect geodata from the following external sources:
You can add images (including photos) to vector geodata from local and external sources. Image files should be in JPEG or PNG format. Read more here.