First, be sure to note in your thread title that you're talking about the Zotero 7 beta.
There are various errors in there, so you'll need to say what the exact problem is that you're experiencing. See Steps to Reproduce for the kind of description we need.
When using the built-in reader to browse pdf, it can not be opened and read smoothly, the page update is slow, and the annotation function is stuck zotero7.0.0-beta.51+7c5600913 (64-bit)
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There are various errors in there, so you'll need to say what the exact problem is that you're experiencing. See Steps to Reproduce for the kind of description we need.
zotero7.0.0-beta.51+7c5600913 (64-bit)