Detecting form field depends not just on the quality of the original file but also, on how well it corresponds to what the form wizard looks for. You will almost always have to make adjustments and corrections manually after running it. To create a editable text field, you can open the PDF (converted from PPT). Goto Tools > Prepare Form and add a text field. Ensure to enable Properties > Options > Allow Rich Text Formatting for your end users to be able to change font, color, size per their choices. I hope this helps.
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