Q: "I have sync issues with iCloud: I have multiple calendars on my Mac. This is where I keep track of all my dates. I have activated all the proper settings for syncing across from iMac to iPhone. When I go to the Mac version and display the calendars. I see three groupings, which all I have ticked in the left panel. When I see the calendar on my iPhone, only that one calendar which shows up in the first two groups. What happened to the rest calendars? Why my Mac calendar not syncing with iPhone and I can't see them on my iPhone? Any suggestion?"
Generally speaking, as long as you have turned on iCloud for calendar and sign in the same iCloud account on all your iOS and OS devices, including iPad, iPhone, MacBook, iMac, the calendars will be synced among the devices automatically without any error. If you are unlucky to encounter Mac calendar not syncing with iPhone like said above, you can refer to the fixes below to troubleshoot.
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Go to the Settings on your iPhone and check whether you have logged in the same iCloud account as that on Mac, which is the basic fix for iCloud not syncing problem.
Go to the Calendar App on your Mac, tap Calendars form the bottom center to check whether all the calendars are ticked or not in the left panel. If you the calendars you want to sync to iPhone haven't been ticked, they won't be updated.
Go to the Calendar App on your Mac, and choose Calendar > Preferences, On the General tab, make sure that one of your iCloud calendars is the default.
If you need to transfer data from iPhone to Mac immediately but the iCloud still not working, how to make it possible? Here is an easy and free solution to move data from iPhone to Mac to update data by using Qiling MobiMover Free, the ultimate iOS data transfer tool to backup iPhone data to PC/PC without iCloud, transfer data from iPhone to iPhone without iTunes, and add contents to iPhone/iPad in a data-safe way.
Step 1. Connect iPad to your Mac with a USB cable. Once connected, tap "Trust This Computer" on your device's screen. Open Qiling MobiMover and select "Phone to Mac" on the main screen. Click "Next" to start transferring data from iPad to your computer.
Step 2. MobiMover will read and load all the compatible files on your iPhone/iPad automatically. Choose Contacts/Messages/Pictures/Audio/Video or other specific types of apps to transfer. The transferred content is kept on Desktop by default, so you need to change the default location before clicking "Transfer".
Step 3. MobiMover will immediately begin to transfer data from iPad to Mac without iTunes. Don't interrupt the USB connection during the course. When it completes, you can open and check the transferred content. Some files, like contacts and messages, are kept as .html files, so you need to use a web browser to open such a type of file.