Error syncing assets

I’m getting a failure to sync error. Any tips for how to troubleshoot this issue?

Relevant console info:

assetSyncProcessor @ assets-sync.js:224

assets-sync.js:152 Forge VTT | Asset Sync complete. 3665 assets processed. 3665 failed to sync

assets-sync.js:632 Forge VTT | Asset mapping file upload succeeded.

foundry.js:45502 forge-assets.json saved to /

Module was updated to work with v9. After updating the module, the sync worked.