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
Under the Book that you'd like to add photos to, tap "Add Photos."
You should see "Camera Roll" in the upper middle part of the screen, and then tap to the right and select "Filter."
From here, you can select the month you would like to see photos from. You can also hide screenshots or filter to only show high-quality photos. When finished adjusting the filters, click "Done."
You can also clear out the Filter by selecting "None" so all photos appear from your Camera Roll.
Then, if you do select the month and year you'd like to use, tap "Apply."
For Android:
Open your Subscription
Open your Monthbook
Choose a Photo Source
Tap on Filter in the upper right-hand corner
Here, you can change the date range, or select an Album
You can also clear out the Filter by selecting "Clear All" so all photos appear from your Camera Roll.
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:
iOS
How to Select Photos from Different Months
Android
How to Select Photos from Different Months