loadUntil property
The level that should be loaded. e.g if the displayed widget will be quite small it might be enough to only LoadUnit.small to just load the small thumbnail
If loadUntil is LoadUntil.small or LoadUntil.large and the respective size is not present in attachment it will load the next available bigger size.
So for LoadUntil.large it will load the full image
For LoadUntil.small it will load the largeThumbnail. If that is also null it will load the full image
Implementation
final LoadUntil loadUntil;