Hello
the existing image-gallery field is really complex in functionality
about complex,
it is meant to compete with standalone gallery components,
it integrates gallery management into the articles instead so instead of having 2 components, 1 for content and 1 for images you have 1
finally, it has several parameters to avoid asking our non-programmers users to do programming work
spending some time to read the parameter descriptions is not too much, we spend endless time developing this and other part of FLEXIcontent
about minigallery, it is a field that remains mostly for compatibility reasons, the image-gallery field is meant to be used in most cases
-- about your question,
the image field has usage 2 modes:
DB-mode, folder-mode (you can have multi-uploaded here)
folder-mode is already modified to support specific folders, this will be enabled in a future version, for now you need to use the specific folder created by our current folder mode which is: (field_id + item_id)
Regards