sync button turning and dates of attachments

two minor problems for which i find no answer. on all my laptops, syncing starts with a very long period during which the green arrow turns without message. at some point only (after minutes) the sncing actually starts. sometimes, i thought it helped when i got out of zotero or even firefox an tried again,but it does not always work.
second problem: dates of modification of attachments don't always change when i do apply changes.
thanks for suggestions
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