Workaround: Append Changes to Existing Text

Thank you for this, Jan Asmuth‌.  Have you heard about any updates? 

Good day guys, here's another workaround i did using a component workflow https://community.nintex.com/t5/Community-Blogs/Using-a-Component-workflow-to-track-the-history-of-an-item/ba-p/88782

for the o365 responsive form, I was able to replicate the append text that SharePoint already offers, without the use of SharePoint functionality. I was able to achieve this through the use of three variables, one text field, two rich text fields, a label for output, and a rule to set and clear fields.

fields:

• Comments - text short 
• CommentsAppended - text long rich
• CommentsAppended2 - text long rich

label:

• lblComments

Variables:

• varcurrentUserDateTime = [Context].[Current user display name] +" ("+ formatdate(dateNow(),"medium")+"):"

This provide the user and time stamp for the comment

• varCommentsAppended = [Form].[varcurrentUserDateTime]

+ " <i>" + [Form].[Comments]+ "</i>" 

This creates the message with user and time stamp

• varCommentsAppended2 = [Form].[CommentsAppended]

+ [Form].[CommentsAppended2]

This appends CommentsAppended to CommentsAppended2 for the historical text

Rules:

setCommentsAppended

if

 Comments is filled

then

 CommentsAppended     value   varCommentsAppended

 Comments                     value   ""

 CommentsAppended2  value   varCommentsAppended2

 CommentsAppended    value   ""