To upload a completed workout to intervals.icu, I export a .fit file from TrainerDay to my computer and then upload this to intervals.icu. When I do this, on one time intervals.icu shows all of the interval markers from the workout, but for two other workout sessions it does not. Is there a problem with the exported .fit file?
I believe interval markers is a feature of intervals.icu and not something included in the fit fit file (I am pretty sure we donāt include anything) so it would seem intervals is better at finding those intervals but maybe an intervals expert here can help clarify. @MedTechCD Want to help 
I should say you should be able to do dropbox or strava for an automatic transferā¦
Anything you need to know about selections and intervals in Intervals is described here:
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Thanks both for your fast replies! I think I have it figured out now. The first TrainerDay session that I uploaded to intervals.icu, intervals.icu had correctly identified the intervals itself. However, the second ride had āmicro intervalsā and then these were not properly detected. Then, the third ride had only small intensity variations, so no intervals were detected. Still, after opening the exported .fit files in Strava, I could see all the lap markers were in the exported file. So, I then deleted the sessions in intervals.icu, activated āUse laps for intervalsā in the Settings, and reimported the session .fit files. After doing this, I see all the laps from the TrainerDay session. I have now re-verified, and having āKeep all lapsā activated is not enough.
What had added to my confusion on this is that, when I do a TP programmed session outside using my Garmin, when the Garmin .fit file auto-uploads to intervals.icu, I see all the Garmin laps when only āKeep all lapsā is activated in the Settings. Somehow, the TrainerDay .fit files require that āKeep laps for intervalsā is also activated. However, maybe that is as it should beā¦
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I disagree on thatā¦
Every other app controlling structured workouts, logs step markers (laps). I have never used the FIT or TCX from Trainerday because I always dual record on my head unit, so canāt be absolutely sure. But if Trainerday isnāt logging a step marker in the output file, that is wrong behaviour because it should. I suggest you check it out and add steps asap if they are not included.
That is how it should be and is clearly explained in my guide post on the Intervals forum.
The option is āUse laps for intervalsā an not āKeep lapsā¦ā
If this option isnāt ticked, you instruct Intervals to detect intervals with its internal algorithm (detection on power/HR/Pace) and ignore the lap markers in the FIT. If it is ticked, Intervals will not detect by its algorithm and simply follow the lap markers in the file.
PS: @Alex The OPās comment would imply that the TrainerDay output file has lap markers, as it should be.
Yes, I thought that was the case for our TCX files (lap markers) but was not so sure on the fit files but I agree sounds like the fit files have them as well. I also did not realize intervals had this lap to interval featureā¦ learn something new every dayā¦ now letās see if I remember this Thanks for your help.