UV Glue TG sometimes might gives problem to FP sensor and it is expensive. It is risky as well sometimes accidentally lifted by casing, then will not close gap anymore. Thanks for your sharing.
Like other said, maybe you can try Hydrogel/silicone type such as Rockspace or X.one. I tried Rockspace clear type, not bad actually ... just cross finger it is compatible with casing. Anyway it is cheaper because I managed to get RM30 for 2pcs last time from Ipoh seller.
Maybe is my personal opinion that the camera module is not safe. In fact it is aluminium and not easy to scratch. But if it is black, I am not dare to comment as I watch Jerry's video actually he scratched it and black color coating came out.

For camera lens, I have no idea what material glass it is.. If it is sapphire, then should be good without protection. Waiting for someone to tell me.
To comment on camera TG, I believe for sure the quality of photo will be affected once installed... maybe very minimum if get good one. I bought one LEEU brand and will give a try. Please take note camera TG might give problem to casing which actually I notice most casing spigen/ringke/samsung ... did cover at least edges of camera module. Except ESR brand TPU casing which doesnt touch the camera module at all.
I will try LEEU brand camera TG. and hope it will not give me problem with my ringke fusion or samsung silicone cover. The TG must be thin enough not to conflict with casing..

I just got the lagging issue and sure enough the Hong Leong Bank ad is back. Managed to replicate the issue on a S9 and A50.

I am spigen fan too. But recently I found rinke fusion matte is really cool and more sleek if compared with spigen hybrid. Furthermore, it has matte surface that will not catch any finger dirty marks... so I go for it. Spigen protection and quality better. Ringke fusion just good enough and expose the beauty of Phantom silver.

Used spigen case for last few phones. Bored already. No new designs so now trying ringke and surprisingly their quality for the price is very good
UAG cases are also nice but the price

I used to think like that until I dropped and cracked the screen of my Note5 and it cost me like RM700 to replace. Now I will straight away install TG SP and lately TG camera protector too.. save me from tears later.

My weekend case when s-pen not required

Im using one too for my S9+, a 2m long cable for my 15w adapter.
Planning to get a longer cable for my 25w adapter. The stock cable too short, I need to crawl over to get my phone   
sigh... I just bought an Ori Samsung 25w plug head yesterday. 
Does the adapter heat up or the phone heats up during the charge?
My S21U, my old 15w adapter and ugreen cable heats up while I was charging it. Not sure if the phone is draining too much power from the adapter that causes the heat.
Then when I charge my phone with the newly bought 25w adapter, my phone is warm but the adapter is ok, not hot.

Wondering if 3rd party adapter will heat up or not. How about your cable? Are you using Ugreen cable too? I wanted to get this, https://shopee.com.my/UGREEN-Fast-Charging-...3440.5004537420 but not sure if it supports Super Fast Charge and will heat up or not.

https://www.samsung.com/my/offer/mobile/youtube-premium/

Try that step above

YouTube Premium Offer Terms and Conditions

1. 4 months

a) This YouTube Premium 4 month free trial promotion is open to participants in Malaysia who purchase and activate a Samsung Galaxy S20 (S20, S20 5G, S20+, S20+ 5G, S20 Ultra 5G), Tab S6 Lite, Galaxy Z Flip, Galaxy Fold or Galaxy Fold 5G between February 14, 2020 and March 5, 2021 at 11:59pm MYT. Offer only available to customers who are not current YouTube Premium, YouTube Music Premium or Google Play Music subscribers, have not been YouTube Premium, YouTube Music Premium, or Google Play Music subscribers nor participated in a YouTube Premium, YouTube Music Premium or Google Play Music trial before.

Don't know why I experience abit voice distortion from some videos on Youtube (Dolby atmos auto) when playing at high volume. Anyone else has that?

Mine also cracking 

try it tonite, at factory not so convenient now

Definitely an issue with your earpiece speaker.
I have encountered a similar issue as yours with sound crackling at high volume after I request for screen replacement for my S10. The earpiece speaker was working fine before replacement. After they have changed the screen, I noticed the sound crackling when it play certain bass notes at high volume. The earpiece speaker was not changed because I noticed there is still dust accumulation from my previous usage, so I assume they fiddled and mess up the internal wiring that drive the speaker unit. I send it back to service center to let them check. They did the replacement again FOC this time due to the fact they configure it wrongly. So in the end I get a brand new screen replacement with the earpiece speaker change as well.

The place I got it changed was at Samsung Express Service Centre - The Gardens Mall.
Sorry just notice this post, better as in how? No more crackling or still there but less perceptible?