Confluence: How to remove Attachments during upload phase

I want to remove specified attachments in confluence during or after an attachment upload performed by user.
The user should also get a popup notifier with a message.
Which confluence classes should I use?

I' ve tried using the AttachmentBatchUploadCompletedEvent, but there seems to be no possibility to create a popup notifier.

Moreover removing an attachment in AttachmentBatchUploadCompletedEvent though successfully done causes a
java.lang.NullPointerException at com.atlassian.confluence.pages.AttachmentDownloadPathCache.toKey(
at com.atlassian.confluence.pages.AttachmentDownloadPathCache.toKey(
at com.atlassian.confluence.pages.CachingAttachmentManager.invalidateCache(
at com.atlassian.confluence.pages.CachingAttachmentManager.saveAttachments(
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

any help would be appreciated

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