I want to install DAM package on one AEM environment, but before that , I want to clean entire DAM assets safely. What are the ways to delete and clear DAM safely.
There is not per se a way to clean the DAM. You can delete folders and assets from the DAM root level at /content/dam
Although if you set your new package filer to "/content/dam" it will overwrite the DAM and upon the deployment, you will see only the new assets
You need to fix a missing blobId error, prior to uploading a new package with assets. Please use KB at https://helpx.adobe.com/ca/experience-manager/kb/oak-blobstore-inconsistency-blobId.html as guidance.