In addition to Fadoua's response, notice that Jira can't render SVG files as you can see at the support cases below:
So may I ask you if this is happening with different file types other than svg? If you aren't sure about that, you can also take a look at the file-sytem of your instance (JIRA-HOME/data) or even on the table "fileattachment" as the query below:
select project.pkey,jiraissue.issuenum,fileattachment.filename,fileattachment.mimetype,fileattachment.filesize from fileattachment
join jiraissue on fileattachment.issueid=jiraissue.id
join project on jiraissue.project=project.id
where project.pkey='IFPSERVICE' and jiraissue.issuenum=118
Last but not least, you can also review the log files in real time (JIRA-HOME/log/atlassian-jira.log) when opening the attachment to see if there's an exception that would lead us to the resolution of this behavior.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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