TextBase builder jobs in Flow sometimes fail with the error "TextBase is Offline."
Version 7.0.23227.1 of Flow contains a bug fix which prevents this issue from occurring - consider upgrading if you're still using an earlier version. As a workaround, the following article explains how to manually reschedule the files that failed to be uploaded:
https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0038797