The whole point is that no cable shows. That cable is not rated to go inside a wall.

Use conduit, and size it for the fat connector

The One Connect cable is not in-wall rated, so the way to conceal it properly is to run it through tubing rather than to bury it. Electrical non-metallic tubing between two low-voltage boxes, finished with brush wall plates, keeps the cable serviceable, keeps it clear of framing and insulation, and gives you a path to pull a replacement through later. Size it for the larger connector, which is the one that goes to the One Connect Box: one inch tubing passes it, half inch does not. Check your own cable against the tubing before you cut a hole, because discovering this with the wall already open is the expensive version.

Samsung tells drywall owners to hire somebody, in the instructions

This is Samsung’s own language in the Slim Fit mount guide, and it is unusually direct: check the wall type before installing, always consult an expert for installing on drywall, Sheetrock or gypsum board, and do not fix it to drywall without reinforcement. The mount is meant to land on wood studs, and the guide specifies a minimum stud size of 51 by 102 mm, which is a 2x4. Locate the studs before you drill anything, and drill 3 mm pilot holes, an eighth of an inch, before driving screws. If the position you want does not line up with studs, the answer is reinforcement or a different position, not longer screws into drywall.

Fit the decorative bezel before the TV goes on the wall

The magnetic bezel snaps on around the screen, and the natural assumption is that a magnetic part can go on at any time. On a flush mount it cannot, in practice, because a Frame sitting nearly flat against the wall gives you nothing to work with and no room behind the edges. Fitting a bezel afterward means lifting the panel back off a mount you have already routed a fragile cable to. Decide on the bezel before you start, and fit it during the bench stage while the TV is face down on a blanket.

The cable is the fragile part of the whole system

Every source on this product converges on the same warning: do not bend or crimp the One Invisible Connection cable sharply, because that damages its internal structure and the failure is not obvious. Leave the protective cap on the connector until the moment you seat it, so nothing gets into the contacts while you are drilling and pulling. At the panel, push it in until it clicks and then secure it with the supplied cable holder rather than leaving it hanging on its own connector. When pulling through conduit, pull gently and lead with a fish tape rather than dragging the connector through a tight bend.

Check the L/R markings on the hanging brackets

Samsung calls this out as its own numbered step, which is a reasonable indication of how often it happens: check the left and right markings so the two hanging brackets do not get swapped. They look symmetrical enough to be interchangeable and are not. While the TV is face down, also put the protective sticker on with the arrow facing inwards and fit the protective pads 10 mm below the top edge, both of which exist to stop the panel and the wall marking each other once it is flush.

Decide where the One Connect Box lives before you drill

This is the planning decision the whole installation hangs on, and it has to happen first. Every device plugs into the box rather than the television, so the box needs a home with power, ventilation, and access to change a source or reset something. A cabinet below the TV is the simplest. An adjacent room or closet is the cleanest and the most work. Cutting a recessed media box into the wall is possible and adds an hour or two plus finishing. What you cannot do is decide afterward, because the box location determines where the cable exits the wall, which determines where you cut, which determines whether the run stays inside one stud bay.

Confirm which One Connect arrangement your model year actually uses

Samsung has revised how the panel and the One Connect Box communicate across model years, including moving toward a wireless arrangement on recent sets. That changes this job substantially, because a wireless link removes the cable route and leaves you with only a power run. Confirm what your specific model uses before you plan a conduit for a cable it may not have, or assume wireless on a set that came with a cable. Read the manual for your model and year rather than a guide written about a different one.

Two people on the lift, and level before you let go

Samsung specifies at least two people lifting simultaneously, and on a large Frame that is not a formality: the panel is wide, thin, and being guided onto brackets you cannot see while holding it. Lift by the sides and the bottom edge, never by pressing on the screen. A useful trick from installers is to rest the bottom edge on a box against the wall to take the weight while you tilt the top onto the bracket. Align the paper templates along their guiding line, overlapping them to match your TV size, and tape them up to confirm height and position before a single hole is drilled. Check level with a long level once the plates are up and again once the panel is hanging.