Planner only allows us to attach 9 attachments to a single bucket and we are finding that we hit that maximum on a regular basis. It boggles me that there is a limit on this as they are all linked to SharePoint and planner is only holding the link not the actual document.
Dave Shaw commented
More than 9 attachments is a must!
Planner tasks make a very useful "file folder" of items related to a task. However nine is far too small a number of attachments for any significant task. If there does need to be a maximum it should be something more like 64.
More than 9 attachments would be beneficial