Supposedly Lightroom mobile manages this storage for you and if your phone starts running out of space it will delete the local cache storage and when an image is needed it will pull it off the cloud, so the bigger question is how much storage in your creative cloud will it take as you will probably run out of CC storage before hitting the phone's storage. You can calculate this by taking a few of your images and building a few smart previews. Then click on the smart preview mention below the histogram in grid view and it will show you how much space the smart previews are taking. Divide the total storage by the number of previews you have and you'll find the average size of them. On my machine and this is a bit over 1MB per preview file. Lightroom mobile uses the same type of smart previews so they should give you an idea of the size.
HOLY SHMOKES!!!! Jesus that sounds good to me ! How did you know that....Anyway thank you! I will do that I appreciate you taking the time because that nails it....cheers!!!!
In in the ipad app I couldnt find the smart previews you may mean in the LR CC on my computer ...but when I clicked the menu for the collection in the app, there was an option to clear cache for offline...that number was 312mb for that collection. so perhaps , for that collection, takes up 312mb????
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the bigger question is how much storage in your creative cloud will it take as you will probably run out of CC storage before hitting the phone's storage.
That isn't a concern. It's true that Lightroom Mobile dynamically manages the images to fit within the space on your phone or tablet, but you won't run out of cloud storage for Lightroom because it's a different and unlimited "storage bucket" than the storage that comes with a Creative Cloud account. According to Adobe Lightroom for mobile and Lightroom for Apple TV | FAQ:
Does syncing images to Lightroom for mobile use a portion of the cloud storage I get with my Creative Cloud membership?
No, the images synced with Lightroom for mobile are not counted as part of your cloud storage.
How many photos and videos can I sync across my devices using Lightroom?
We currently do not limit the number of photos and videos you sync in Lightroom.
Adobe can offer unlimited syncing to Lightroom Mobile because it's self-limiting. Since Lightroom Mobile doesn't sync to another desktop computer, your download capacity is limited by the available storage space on your mobile devices.