If you attempt to Analyze an asset and it fails, or an asset fails to analyze on import then you will not see proxy clips and possibly poster frames for the clip. This could be due to a lot of reasons, but you can retry the analyze process to see if it’s something with the clip. To do so, do a get info on the clip in Final Cut Server, then click on the cog wheel menu for the item and select Analyze from the drop-down menu.