THIS IS A TEST INSTANCE. Feel free to ask and answer questions, but take care to avoid triggering too many notifications.

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Are you able to open the capture file in the gui?
https://www.wireshark.org/docs/wsug_html/#ChUseMainWindowSection

Then filter the packet with a display filter:
https://www.wireshark.org/docs/wsug_html/#ChUseFilterToolbarSection

Example of filtering for tcp packets:
https://www.wireshark.org/docs/wsug_html/#ChWorkDisplayFilterSection