How To Fix Voice Memos Is Not Saved After Recording On IPhone

So, i have an iphone x with the new ios 12 installed on it last night. This morning i had an interview class with my lecturer about my thesis. To make it easier for me to takes on every word he says, i choose to record it on the voice memos. I already test it first and it records. After that i pressed the red button and begin recording session, it did shows the recording process with the sound graph or something like that (sorry i didn't know how to called it). After like 57 minutes i done my interview, when i pressed the done button it just bring me to the voice memos and it didn't show the recording i just made. But, when i try to search on the home screen (that one when u swipe to the right and type on the search box) it shows my last already made recording with the correct voice memos names but it didn't show up on the voice memos apps. How can i recover that lost voice memos when i can still search the correct name and it still shows up the memos ?

I try to describe as specific as possible, because i hope i can recover that voice memos because it is really a very very important one. I made this communities support account just for this just to let you know.

Close the app after recording by swiping up to show the missing button then click done. After that and hour recording will take 5 to 10 minutes to show up. I don't know why Apple doesn't fix this and why is the swipe up near the start and stop record button? Have you also see the zoom bug in Safari yet? It has been here for about 3 years!!!!!

I already moved on, because i try almost everything possible. From restarting app, hard restart, trying to see from iTunes, etc. Nothings works. For me, the first thing i notice when the problem occurs is when the voice memos app crashing, or running in the background and suddenly the recording icon on the top left disappear. Just make sure, whenever possible do 5 - 10 times trials of recording for 5 - 10 seconds, and also don't run it on the background. Disable the auto-lock on the settings so the phone screen will still turned on. This may prevent further crashes. I'm doing the follow up interview for my thesis and by doing what I just mention, I always successfully record voice memos. This is just ridiculous that apple didn't solve any of this problems.

Voice memos are voice recording App in iPhone.we can record our voice and play it for future purpose. Also, we have a future like voice call recording. Sometimes we used this recording but there is an error that voice memo is not sav