This answer explains why thumbnail images are not created when a My Passport Wireless Pro is on battery power.*END
IMPORTANT:
My Passport Wireless, Wireless Pro and SSD save products images and files from computers, tablets and smartphones to this single portable drive using a wireless connection.
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Answer ID 34297: WD My Passport Wireless End of Support
My Passport Wireless mobile app for iOS and Android is now in the Limited Updates phase. During this phase, bug fixes, updates for new features, and OS compatibility patches may stop, but Western Digital will continue to provide security updates for the app to address critical issues.
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Western Digital Product Lifecycle Support Policy
As a secondary option to continue using your drive, connect it to the computer as outlined in the User Manual on page 19.
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Description
Thumbnail images are not created when a My Passport Wireless Pro is not connected to a power source in firmware 1.01.11.
NOTE:
The behavior mentioned in this article will change with the next firmware release.
Until the next firmware is released, we invite you to join our Public Beta of My Passport Wireless Pro Firmware
The WD My Passport Wireless Pro is working as intended. Files copied through USB, SSD, mobile apps, or during an automatic backup are not transcoded when My Passport Wireless Pro is running on battery power. Transcoding data depletes the battery when it is not connected directly to a power source.
Resolution
Connecting the My Passport Wireless Pro to a power source will cause the thumbnail creation process to resume.
