Process Bliss allows you to ask the person completing a step to upload a file. There is the option to make this file upload required, so that it's mandatory to upload a file for the step to be completed.
Here's a video to show you how.
To set this up, edit the relevant template or task (the screenshots below will show editing a template).
On the step, click the "Add attachment" button in the bottom left-hand corner. This opens the step 'wizard' which allows you to add more information to the step.
In the Request section, select the "File" button, or drag and drop it upwards onto the step.
This will add a 'Browse' button to the step, next to a label called 'Upload file'. This label can be edited by hovering over this File section and then clicking on it.
You can also select the checkbox to make the person completing this step upload a file before this step can be ticked off. Press the tick icon to save.
Once the template is published, and a task created from it, a file can then be uploaded by the individual carrying out the task.
The icon of an up arrow above a tray represents that a file can be uploaded. The red star next to it indicates that it's required.