I was searching for this as well and found this:

Any operations applied to a Flex sample is remembered for the current session only. If the Octatrack MKII is rebooted or another project loaded, all applied sample edits will be lost. It is thus important sam-ples are saved if you want to keep the any applied edits. In the Flex sample slot list, a blinking star next to the sample name will indicate edited and unsaved samples.

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