When creating a Chatbooks Monthbook, your camera roll will automatically filter to the month you are working on. If you would like to change that month, please follow this how-to on changing the filter for photos you are adding to your Monthbook. There are also how-to videos below showing you how to add photos from a different month as well:
For iOS:
Open your subscription
Open your Monthbook or Monthly Mini you'd like to work on
Under the Book that you'd like to add photos to, tap the blue "+" in the bottom right corner
Once you are on that screen, the dates will be filtered by a specific month
To change the dates, simply tap, "Date" and set your filter again
You can also clear out the Filter by clicking the small gray "x" next to "CLEAR" above the filter dates so all photos appear from your Camera Roll
Then tap "Apply"
For Android:
Open your subscription
Open your Monthbook or Monthly Mini you'd like to work on
Tap the blue "+" in the bottom right corner to add photos
Select "Add photos"
Choose a Photo Source
Tap on Filter in the upper right corner
Here, you can change the date range and select "Apply Filters"
You can also clear out the Filter by selecting the small gray "x" next to "CLEAR" above the filter dates so all photos appear from your Camera Roll
Tap "Apply Filters
You can also filter by album - to do this you'll choose your photo source and then you will see "Local" at the top center. Just below this you can scroll through the albums on your device
Additionally, the videos below will walk you through the process of adding photos from a different month to your Monthbook for both iOS and Android devices:
Android
How to Select Photos from Different Months