PDF fillable for smartphone

I can fill it in with Adobe Reader on Apple iOS.

However, I had to attach it to an email, send the email to my smartphone, and then open it in Reader.

Opening it directly from Hernanb's URL link wouldn't respond.

Also, when filling in PDF forms on a smart phone, the user must zoom/pinch in to make the fields big enough to be recognized by a fingertip.

If they are zoomed out too small, the software can't recognize which field is being accessed by the fingertip.

You'll need to have a PDF reader software program on the mobile device. For Acrobat's mobile device readers, look here and click the top tabs for iOS, Android, Windows, iPad.

Free mobile app and PDF viewer for Android phones | Adobe Acrobat DC

Other software companies have their versions, too, because the PDF file format itself is an international standard (and Acrobat is Adobe's brand of the format, as well as PDF software tools).

What is the problem?