# Desktop to Cloud to Mobile sync problem

**URL:** <https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840>\
**Category:** CLZ Books Mobile\
**Created:** [June 20, 2026, 9:59am UTC](https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840 "2026-06-20T09:59:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![GJL](https://club.clz.com/letter_avatar_proxy/v4/letter/g/db5fbb/32.png) [@GJL](https://club.clz.com/u/GJL)\
**Post date:** [June 20, 2026, 9:59am UTC](https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840/1 "2026-06-20T09:59:53Z")

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I have been using Books Desktop for over 10 years to sync to cloud, and Books Mobile to sync to my Android phone. I love this software!

In the past two weeks or so, I find that Books Mobile will not sync from CLZ Cloud. The mobile app says that I have cleared my collection in CLZ Cloud, but I haven’t, it is there if I look through my browser. This was all working fine until a couple of weeks ago. Here is what the mobile app says:

 ![clz-mobile-sync-dialog](https://club-cdn.clz.com/original/3X/3/8/38f1f93978d6ceea68f53673bd30c1da9bb7768f.png)

In my workflow, I do all adds/edits/deletes on the Desktop app and I have always treated that as my primary source of truth. So, I am reluctant to upload from Mobile as this will break that workflow. I have some recent adds on the desktop side that the mobile side does not have yet, so an upload from mobile would not seem right.

I realize that Desktop is legacy now, but the currently problem seems to be between Mobile and Cloud.

Any suggestions ?

Thanks,

Gordon

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**Author:** ![CLZ\_AJ](https://club.clz.com/user_avatar/club.clz.com/clz_aj/32/9_2.png) [@CLZ\_AJ](https://club.clz.com/u/CLZ_AJ)\
**Post date:** [June 22, 2026, 10:33am UTC](https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840/2 "2026-06-22T10:33:12Z")

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Did anything happen on the desktop computer, like switch computers, or restored a backup that got synced?

In any case the solution:

**On your mobile CLZ Books app on Android:**

1. Tap the top left side menu icon to open the side menu.
2. Tap “Maintenance” and then tap “Clear Database”.
3. Tap the top left side menu icon again to open the side menu.
4. Tap “Sync with CLZ Cloud” and sync your entire collection from CLZ Cloud down to your mobile device.

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**Author:** ![GJL](https://club.clz.com/letter_avatar_proxy/v4/letter/g/db5fbb/32.png) [@GJL](https://club.clz.com/u/GJL)\
**Post date:** [June 23, 2026, 10:29am UTC](https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840/3 "2026-06-23T10:29:24Z")

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Hi, thanks for the guidance ! I followed those instructions and my phone has downloaded all the records from the Cloud. I have a further problem with custom images that I will describe in a new topic. But this is progress, thanks again!

Regarding cause, I did not restore a backup or switch computers on the Desktop side. I don’t remember any other significant change on the desktop side. But, the desktop is pretty old and I am planning to replace it.

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**Author:** ![GJL](https://club.clz.com/letter_avatar_proxy/v4/letter/g/db5fbb/32.png) [@GJL](https://club.clz.com/u/GJL)\
**Post date:** [June 24, 2026, 1:53am UTC](https://club.clz.com/t/desktop-to-cloud-to-mobile-sync-problem/21840/4 "2026-06-24T01:53:35Z")

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In my previous message I mentioned a problem with custom images. I cleared my Cloud db and re-synced it from the desktop app and this resolved the problem.