Unfortunately, the Dropbox app on iOS only provides limited drag-n-drop functionality. If you would like to upload documents nevertheless, please define Dropbox as memory source. Proceed as follows:
Press “Add document” in inSign. Select “Browse” from the pop-up. A new dialogue opens (iCloud Drive / your file system). Click “Browse” at the bottom and then top left “Locations”. Your Dropbox should now be visible to the side and can be selected. Now you can also select items for download directly from your Dropbox without having to save them on your device.
That’s all right. The biometric data of the handwritten signatures were correctly stored in the PDF document and the document itself was protected from subsequent modification with a “technical” signature. This “technical” signature was executed by www.is2.de, you can accept this certificate manually in the certificate details. Click a signature in the PDF → Signature properties → Show issuer certificate … → Add trustworthiness → Add to trusted certificates… as trustworthy. This has no influence on the verifiability or even legal certainty of the signatures.
Yes, all documents and signature details are protected by encryption and electronic seals. Subsequent processing, e.g. with Adobe Acrobat, destroys the electronic seal and the document is recognized as modified. The signature is displayed as “invalid” or the document is marked as “Document was changed after signature”. Comments (but no other changes) on signed documents are generally permitted. There is no reason why this should not be the case. If in doubt, you can display the signed version (i.e. without comments) of each signature. The easiest way to do this in Adobe Reader is to right-click on the signature, then select “Show signed version”.
Yes, but only with the “inSign enterprise” usage model. Various methods of transmission (e.g. in docker, etc.) with installation instructions are available. The inSign team is happy to support your installation project.