I put all the photos in a Microsoft Word topic, including explanations for each photo and converted this to a pdf before submitting.
I'd advice you just follow the document checklist so every document about same thing can be scanned as photos, added to a Microsoft Word document and converted to a pdf before upload. We did this for our receipts and proof of combined expenses.
Any documents where you and your partner have to sign (I think there are just two of this in our case) should be signed physically or with a scanned signature before uploading. The documents that require only the Principal Applicant's signature do not have to be signed (In our case, about four of this forms were already available to fill electronically online). There is a final entry for the principal applicant to fill in their full name as an electronic signature before submission.
I'd advice you just follow the document checklist so every document about same thing can be scanned as photos, added to a Microsoft Word document and converted to a pdf before upload. We did this for our receipts and proof of combined expenses.
Any documents where you and your partner have to sign (I think there are just two of this in our case) should be signed physically or with a scanned signature before uploading. The documents that require only the Principal Applicant's signature do not have to be signed (In our case, about four of this forms were already available to fill electronically online). There is a final entry for the principal applicant to fill in their full name as an electronic signature before submission.