LR5.3. Can't seem to export.

Need help guys.
I finished developing the photo and trying to export the RAW File to PS then to print.
I tried to export in format of TIFF and or PSD. But the file was not saved.
I checked my Passport backup drive and have plenty of space ( 870gb free of 1T)
Does 75 pixels per inch setting have any thing to do with it not able to export?
Many thanks

Are you (1) exporting the image to a folder ("Export to Hard Drive") and then trying to open the image in PS or are you (2) right clicking on the image in LR and choosing Edit In -> Edit in Photoshop CSx?

If you do it the second way (which is what I do) then no image is saved to your HDD until you save it after editing in PS. You can either Save or Save As. Also, for this method you need to go to Edit -> Preferences and set things up under the External Editing tab.

75 PPI doesn't have anything to do with your issue.

Just curious though .... are you doing editing in PS or just using it to print. If you're only using it only to print then you're doing a lot of needless work and making files that don't need to be made. Soft proofing and printing in LR works really slick and you don't need to make any additional files. I got rid of (completely deleted) almost all of the TIFs and PSDs that I made over the years when I switched to a LR workflow. Now about the only time I need to make a PSD is when I need to use CS6's better content aware healing brush or layers.

Thanks Bob,
I figured it out. Somehow either my computer can't handle the loads or LR processing, if I have too many layers or processing done to the photo, the export will not work.
Now, I just make few steps (sharpening, changing the curves, and gradiance fill lights) and quickly send it to export and Bam. Got it to store on the drive.
Btw, Which file type is better to save it when I needed to go over some masking or cloning from PS....Should I save it under TIFF or PSD?
Thanks again.

Either PSD or tiff should work and save the layers. If it doesn't then something is "amiss". Postshop typically puts out a message about "compatibility" issues, pay attention!!

LR does not do layers. If the problematic file had layers it could only have been done in PS. Yet you wrote, "I tried to export in format of TIFF and or PSD. But the file was not saved." Since "export" is a term used in the LR interface and not by PS, it sounds like you tried to use the Export dialog in LR, in lieu of using the "Edit in ..." function, with the intention of later opening it in PS and that LR-generated file was not saved and therefore never reached PS. Bob's answer was based on that understanding, but your second post contradicted the first. Clarity (and not the local contrast kind) improves communication.

If, however, I am at fault and have misunderstood you and it was in fact LR that could not save the file, you should probably examine your computer if it chokes on a single layer. uncompressed, 16 bit, 114.5 MB tiff. That is the maximum size of an exported tiff from the 70D and it is not affected by the amount of editing done in LR. A multi-layered tiff from PS will be considerably larger, however, and might well be too big for an older machine with inadequate memory. Unless there is a strong possibility that you will be returning to the image to make changes to the layers, you should at least flatten it and if that is not enough, to convert to 8 bits and store it as a high quality jpg. Or, alternatively, to do all the tonal and color edits in LR (in high bit depth) and send to PS only an 8 bit file which would be good enough for edits that don't require big tonal shifts, like cloning or sharpening.

If the work done in PS can easily be repeated if necessary - simple cloning, for instance, or straight-forward sharpening - the best course might be to not save the output from PS at all, but rather remain with only the original Raw and the LR catalog. (Both of them suitably backed-up, of course.)