Questionobjects MAY have anendTimeproperty indicating the time when the poll ends. Some implementations useclosedproperty instead ofendTimeor in addition to it (even if the poll is open). Consumers MUST processclosedin the same way asendTime.
What implementation is this? Alternatively, do you have the URI used for closed?
Second part: Mastodon doesn’t allow posting an image attachment with a poll. See statuses API methods - Mastodon documentation
Should this be an universal thing of a mastodon idiosyncrasy?