THE REST MODULE
To communicate with your gallery3 installation you have to enable a gallery3 system module called „REST API Module“. Therefore please login into your gallery3 installation with your admin account. Then go to Admin->Modules
EXTENDED REST MODULE
The extended REST module will be provided by us. It helps iGallery3 to get the full resolution album cover and to receive your pictures GPS information (if available). You can get it https://github.com/mrJakez/gallery3-extended_rest/archive/master.zip. Extract the content of the ZIP archive and put it into the /modules folder of your gallery3 installation. Now you have to activate the extended REST module in the Admin->Modules section of your gallery3 (Please note that you must be logged in for this with your admin account)
To get the best results you have to install the square thumbnails (square_thumb) extension. Otherwise iGallery3 will transform your thumbs to squares, which will result in a loss of quality. You can get this module right here!
THE EXIF GPS DATA MODULE
The second additional module is the Exif GPS Data module (exif_gps). It extracts the GPS information out of your images Exif headers and delivers them with the help of the extended REST module to the iGallery3 app. Without this module the GPS map is deactivated.
ENABLE GUEST ACCESS
If you prefer to login into your gallery installation with your guest account, you have to enable the guest access in your advanced settings. After the activation you can set “Guest Access” in the iGallery3 settings screen to YES.