My wife just bought a new Lenco CD 300 cd player with Bluetooth.
She wanted to listen to CDs on her iPhone over Bluetooth but when I turn on Bluetooth in the CD 300 the only Bluetooth enabled device in our place that recognises it as a connectable device is our TV despite multiple PCs, computers, tablets, and handys.
Probably I should have posted this under the complaints thread.
The device is working as expected, the CD player will only output a sound signal to a bluetooth speaker or headphones (the TV in this case acting as speakers). The iPhone itself is designed to transmit audio via bluetooth, not receive it (other than as a mic input).
An iPhone makes a terrible speaker - that why people play music from their iPhone over Bluetooth speakers. If she just wants to listen to CDs at home, why does a normal CD player not do the job?
We have around 17 GB of mp3s distributed around various Windows PCs, Android Mobile Phones and older iPhones but my wife's new iPhone and Macbook are resisting all our attempts to transfer them.
I've never had a Mac, but I looked up how to play mp3's on a Macbook, and it says this:
"Open QuickTime on your Mac computer. Step 2. Drag and drop the audio file into QuickTime directly to open the MP3 file and play it right in QuickTime."
QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images, and interactivity. Created in 1991, the latest Mac version, QuickTime X, is available for Mac OS X Snow Leopard up to macOS Mojave. Apple ceased support for the Windows version of QuickTime in 2016, and ceased support for QuickTime 7 on macOS in 2018. As of Mac OS X Lion, the underlying media framework for QuickTime, QTKit, was deprecated in favor of a newer graphics framework, AVFoundation, and completely discontinued as of macOS Catalina.Wikipedia
Read the thread. They wanted to get the CDs to play over the iPhone from the CD player via blue tooth. Not everything is about the way "you" chose to do things.
If you are trying to consolidate them, bring the MP3s to an external hard drive, if you have a lot, it'll take a little while - I have about 1TB of MP3s - but, with the music consolidated on the external HD, you should be able to play it on a most computers (even the MacBook) through Apple Music (the awful replacement for iTunes). Then it's a matter of making sure that your wife's phone's account is the same as the one on the MacBook, and you can transfer to music via a charging cable. It's very difficult to get music off of the iPhone and into the computer, but if she has purchased it through Apple Music, it should automatically be available on her computer if it's the same account. Otherwise there are third party software that can be used (I won't recommend any because I'm not a fan of any in particular).
Note, that using the physical cable, not bluetooth, is by far the best and fastest way to get the exact music you want off of the MacBook and on to the phone.
You should be able to sync stuff via finder to your newer phone - connect it and then the phone sync options appear in finder on MacOS once you select the phone and you can pick playlists and the like as you did in iTunes. This of course assumes you have the mp3s on a drive which that Mac can see such as a local drive or NAS.