The File upload input block allows you to collect files from your user.
File upload input in flow
The placeholder accepts HTML.

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Size limit

There is a 10MB fixed limit per uploaded file. If you want your respondents to upload larger files, you should ask them to upload their files to a cloud storage service (e.g. Google Drive, Dropbox, etc.) and share the link with you.

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Visibility

This option allows you to choose between generating public URLs for the uploaded files or keeping them private. If you choose to keep the files private, you will be able to see the file only if you are logged in to your zazubot account. Note that if you choose to keep the files private, you will not be able to use the file URL with other blocks like Attachment in the Send email block or others. These services won’t be able to read the files. By default, this option is set to Auto. This means that the files will be public if uploaded from the web runtime but private if uploaded from the WhatsApp runtime. Because on WhatsApp, the file is already uploaded to the WhatsApp server, so there is no need to also upload it to zazubot (only if you need to make the file URL publicly accessible).