I watched several videos on this but nothing helped.
Please help me solve this problem
Sometimes this is caused by your mesh normals. If using BLENDER -In Edit Mode, select the object, then hit “Shift + N", which should recalculate the normals. Alternatively, you can use the menu: Edit Mode, select the object, then go to “Mesh > Normals > Recalculate Outside”.
This should fix any invisible parts of your mesh and you’ll have to reupload into Roblox.
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Also in Blender look up how to show face orientation. There are a few ways to show which is an inside and an outside face.
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I did everything as you said but now when I upload the mesh to roblox studio it just doesn’t show up. Instead of the mesh that I need, it remains just MeshPart
Can you send a screenshot of what your mesh looks like in edit mode after following the step below?
Exterior normals are colored blue and the interior normals, red. Any normals on the outside that are red are normals that have been flipped. Red will not show within Roblox when imported.
If you see red, you should be able to select the faces and use the steps in the comment above to recalculate them
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The only other thing I can think of is that your mesh faces have more than 4 vertices. You can press “K” in edit mode to use your knife to connect points or add more.
I believe these are called N-gons? You generally never want more than 4 points making up a face on your model and yours has 10 on that side facing the camera.
Edit; connect your vertices together like this, all the way around the model- it should help!
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Ah, making progress! That definitely was the cause! It seems like the sides of your model may still be over 4 points to a face- can you show me the sides facing the camera?
If the sides meet the 4 point rule then I’d try checking your face orientation again after you made those new faces 
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Hm, seems correct! The only thing I believe I can suggest to possibly fix this is adding more loop cuts (Edit Mode > CTRL+R)
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Again the same situation, when I upload the mesh in Roblox Studio MeshPart does not change
I also noticed that everything inside my mesh is red.
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I sent you a DM!
But, in the meantime, I have another theory. With the way the model is importing, it /looks/ like it could be a issue with the vertices rather than the faces. Sometimes when creating an object using “E” to “extrude” can sometimes result in double vertices directly ontop of one another- making them visibly hard to see until you encounter shadow or import issues.
I manually check this on small models by selecting a point in edit mode and “G” grabbing it and moving it, if a vertex remains behind then you have double vertices.
A fix for this; Select both vertices > Right Click > Merge Vertices > At Center (or At Last and it will merge to the last vertex you selected.
Heres a tutorial I found for an automatic way to merge vertices close to one another:
EDIT: This was the solution! OP sent me the model within direct messages and I confirmed it was indeed a double vertices issue! If you’re having the same issue, follow my steps above! 
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Modeling on Blender is very hard on some situations, this situation is a good example.
Though this isn’t a perfect solution, editing the model’s faces can make itself fix. Obviously, you can just do a quick A and CTRL + T during the faces selection mode.
I don’t know what you guys are talking about, to be honest in the solutions on how to fix that part.
If you’d send over the file in .obj, I’ll be able to record and show the method correctly I do not really have a good example to use for this problem as it has gotten less often encountered due to my knowledge expanding further on to some extent.
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Have you already used the doublesided?
Yes, I used it, it didn’t help.
Don’t use DoubleSided for meshes like @AlexZTDev suggested unless they are a flat mesh like a piece of paper or a leaf. The reason is that you are creating more sides that Roblox needs to display and this can lead to lag problems. It also affects how the shading of sides looks.
Go into Edit mode and click A. This will select all the items (vertices, edges or faces depending on what tool you have selected, but it won’t matter which) then click the Mesh tools tab and click the Clean up tool. Select the Merge vertices tool and it should join all the vertices at similar locations. You may also need to click on the pop up tool bottom left of the screen and expand it to change the value from (I think) .0001 to something higher like .003. When you do this it’ll take all those double or triple vertices and make them one vertex.
After that happens then your Normals may be messed up giving weird shading. Click A to select all, select the Mesh tool tab, select Normals, then from the drop-down menu choose Reset Vectors.
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Where is the Mesh tools tab? I’m just new to Blender and don’t know much yet
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Edit mode.
Top left of screen there are tabs just above the viewport.
Also try googling issues you have with Blender since these are Roblox forums, not Blender forums. 
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