With the development of Universal Forms, we are including accepted file types, rule-based logic for required/not-required, maximum number of files, minimum number of files, and maximum file size. This should also include invalida characters.
If you have any other requirements, please let us know in the comments section below.
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We are very pleased to announce the New Responsive Designer for Office365 has now been released. This update includes many updates and features, including conditionally requiring attachments based on rules.
Please ensure you have updated your app to see the new designer choice.
EuanDario Cassinerio commented