The "Limit" field refers to a field created in CB containing the value of the maximum number of photos that the user can upload.
I imagine that the field can be used to diversify by user limits. While if you choose the custom value it must be entered in the next field and is valid for all users.
I hope I have responded well and have been of help to your question.
The following user(s) said Thank You: nant, krileon
