Please note that the intro and outro of your tracks must not be cut off. If your track ends with a fadeout, then it must not be cut off. If you end on a beat, then the end of the track must be in a meaningful place, for example not in the middle of a sound.
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Generally, according to the guidelines of the stores, it is also not allowed that several tracks of a release "fade into each other". There must always be at least a short fade to avoid audible clicks.
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There are numerous free audio tools online, such as Audacity, for example, with which this can be done quickly and easily.