Adobe Sign Attaching Images

Does anyone knows any issues with uploading images to a adobe sign web form on an IPHONE?

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I have several users reporting an intermittent error when trying to attach an image to an ADOBE SIGN WEB FORM on a IPHONE. The adobe sign app simply does not loads the options for the users to select the image they what to upload or take a picture.
While the user is filling out the form, it has some fileds that they have to upload image os theis documents to validade their application form. And in some cases none of the images fields will open the "options" to upload a picture or take a picture. In other cases, it starts working, for 1 or two 2 image fields, then suddenly it stops working and will not enable to upload any more images...  But all these erros have been happening only in Iphones.