The Auto Append button is available on the collection toolbar when the ClipHistory tab is active.
When AceText captures text into the ClipHistory because Automatic Capture is active or because you press the hotkey to capture text on the clipboard into the ClipHistory, Auto Append adds that text to the most recently captured clip in the ClipHistory rather than adding a new clip. This way you can easily create a single clip from many bits of text copied from another application.
If AceText has already captured multiple bits of text into separate clips then you can append them using the Merge Clips button on the collection toolbar.
When you click the Auto Append button, you will be asked which characters, if any, you want to use to delimit each bit of copied text in the clip. You can select one of the common delimiters, or type in whatever text you want to use as a delimiter. If you do not use a delimiter, the copied pieces of text are appended to the clip one right after the other, without any space between them.
Click the downward pointing arrow next to the Auto Append button to quickly turn on Auto Append using one of the common delimiters. The drop-down menu also has an option labeled "Insert at The Start". Selecting this makes Auto Append add the text to the start instead of to the end of the clip. That will still be the topmost or bottommost clip in the ClipHistory as chosen in the Operation Preferences.
When Auto Append is enabled, clicking the Auto Append button disables it. To change the delimiter while Auto Append is on, either turn off Auto Append and turn it on again, or click the downward pointing arrow to access the Auto Append drop-down menu to pick another delimiter.
If the hotkey to capture text on the clipboard into the ClipHistory is disabled then activating Auto Append automatically activates Automatic Capture too. Otherwise, Auto Append would have no effect. Turning off Automatic Capture then also automatically turns off Auto Append. If the hotkey is enabled then you can turn Auto Append and Automatic Capture on or off independently as Auto Append can also work with the hotkey.
Activating Auto Append automatically cancels Auto Split.
See Capture, Enter and Store Text to learn how to use AceText.